v3.7.0.1

Long-Term Debt (6.25% Senior Notes Due 2022) (Details) - Senior Notes - Senior Notes Due 2022 - USD ($)	3 Months Ended
	Mar. 31, 2017	Apr. 25, 2014
Debt Instrument [Line Items]
Interest rate percentage		6.25%
Aggregate principal amounts of debt offered		$ 900,000,000
Prior to May 1, 2017
Debt Instrument [Line Items]
Percentage of principal amount, plus accrued and unpaid interest with proceeds of certain equity offerings	106.25%
Redemption period after completing equity offering	180 days
Percentage of aggregate principal amount of Notes outstanding after redemption	65.00%
Percentage of principal amount redeemed	100.00%
Percentage that may be redeemed upon change in control	101.00%
Prior to May 1, 2017 \| Maximum
Debt Instrument [Line Items]
Percentage of redemption price of principal amount plus applicable make-whole premium and accrued and unpaid interest	35.00%
On or after May 1, 2017
Debt Instrument [Line Items]
Percentage of principal amount redeemed	104.688%
12 month period beginning May 1, 2018
Debt Instrument [Line Items]
Percentage of principal amount redeemed	103.125%
12 month period beginning on May 1, 2019
Debt Instrument [Line Items]
Percentage of principal amount redeemed	101.563%
12 month period beginning on May 1, 2020
Debt Instrument [Line Items]
Percentage of principal amount redeemed	100.00%

Debt Instrument, Redemption, Minimum Percentage of Aggregate Principal Amount Remaining after Redemption

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- Definition

Debt Instrument, Redemption Period

+ References

No definition available.

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- Definition

Debt Instrument, Redemption Price, Percentage of Principal Amount Plus Accrued and Unpaid Interest Redeemed Upon Completion of Equity Offering

+ References

No definition available.

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- Definition

Debt Instrument, Redemption Price, Percentage of Principal Amount Redeemed Upon Change in Control

+ References

No definition available.

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- Definition

Face (par) amount of debt instrument at time of issuance.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=64930739&loc=d3e28878-108400

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28551-108399

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- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(1))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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- Definition

Percentage price of original principal amount of debt at which debt can be redeemed by the issuer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 470
-Section 50
-Paragraph 3
-Subparagraph e
-URI http://asc.fasb.org/extlink&oid=6479336&loc=d3e64711-112823

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- Definition

Percentage of principal amount of debt redeemed.

+ References

No definition available.

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