Share-Based Compensation Expense - Narrative (Details) - USD ($) $ / shares in Units, $ in Millions		3 Months Ended		6 Months Ended		12 Months Ended
	Apr. 12, 2024	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024	Dec. 31, 2022
Share-Based Compensation Expense (Details) [Line Items]
Share-based compensation expense		$ 0.8	$ 0.5	$ 1.6	$ 1.4
Aggregate intrinsic value of stock options outstanding		$ 0.1	0.4	$ 0.1	$ 0.4
Granted (in shares)				0	295,229
Chief Executive Officer
Share-Based Compensation Expense (Details) [Line Items]
Share-based compensation expense			$ 0.5		$ 0.5
Granted (in shares)		295,229			295,229
Share-Based Payment Arrangement, Option
Share-Based Compensation Expense (Details) [Line Items]
Unrecognized compensation cost		$ 8.7		$ 8.7
Period of recognition for share-based compensation expense				3 years
Share-Based Payment Arrangement, Option \| Minimum
Share-Based Compensation Expense (Details) [Line Items]
Vesting period				1 year
Share-Based Payment Arrangement, Option \| Maximum
Share-Based Compensation Expense (Details) [Line Items]
Vesting period				4 years
Restricted Stock Units
Share-Based Compensation Expense (Details) [Line Items]
Granted (in shares)				2,640,360	1,629,335
Vested (in shares)				301,933	264,664
Cancelled or forfeited (in shares)				536,600	520,226
Restricted Stock Units \| Director
Share-Based Compensation Expense (Details) [Line Items]
Vesting period				4 years
Restricted Stock Units \| Chief Executive Officer
Share-Based Compensation Expense (Details) [Line Items]
Granted (in shares)			88,636		88,636
Vested (in shares)	97,994		97,994		97,994
Cancelled or forfeited (in shares)	244,267
Ladder RSUs
Share-Based Compensation Expense (Details) [Line Items]
Share-based compensation expense			$ 0.7		$ 0.7
Expiration period of grant						10 years
Grant date stock price (in dollars per share)						$ 9.36
Expected volatility						85.00%
Risk-free interest rate						3.30%
Expected dividend yield						0.00%
Ladder RSUs \| Chief Executive Officer
Share-Based Compensation Expense (Details) [Line Items]
Granted (in shares)						208,333
Percentage vesting in increments certified by plan administrator						10.00%
Expiration period of grant						10 years

SPRUCE POWER HOLDING CORP 10-Q