Benefit Plans, Changes in Plan Assets and Benefit Obligations Recognized in Other Comprehensive Income (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Change in Plan Assets and Benefit Obligations Recognized in Other Comprehensive Income [Abstract]
Total recognized in other comprehensive income	$ (30.6)	$ (5.6)	$ (35.3)
Pension Benefits [Member]
Change in Plan Assets and Benefit Obligations Recognized in Other Comprehensive Income [Abstract]
Current year actuarial gain (loss)	29.7	3.8
Amortization of actuarial (gain) loss	1.1	2.2
Total recognized in other comprehensive income	30.8	6.0
Post-Retirement Benefits [Member]
Change in Plan Assets and Benefit Obligations Recognized in Other Comprehensive Income [Abstract]
Current year actuarial gain (loss)	0.1	(0.1)
Amortization of actuarial (gain) loss	(0.3)	(0.3)
Total recognized in other comprehensive income	$ (0.2)	$ (0.4)