v3.22.4

Significant Accounting Policies (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Allowance for credit losses	$ 12.2	$ 12.1
Bad debt expense	8.7	3.3	$ 1.5
Depreciation and amortization	390.9	365.8	357.9
Write-off of software development costs	0.0	0.0	$ 13.6
Other Assets [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Goodwill	$ 13.2	$ 13.2
Minimum [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating and finance leases, remaining lease terms	1 year
Maximum [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating and finance leases, remaining lease terms	7 years
Depreciable Assets Depreciation Rate [Member] \| KCSR [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Depreciation and amortization	$ 12.0

Lessee, operating and finance leases remaining lease term.

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KANSAS CITY SOUTHERN 10-K