Benefit Plans - Changes in Plan Assets and Benefit Obligations Recognized in Other Comprehensive Income (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024
Pension Benefits [Member]
Benefit Plans [Abstract]
Current year actuarial gain	$ 7.8	$ 29.7
Amortization of actuarial (gain) loss	0.8	1.1
Total recognized in other comprehensive income	8.6	30.8
Postretirement Benefits [Member]
Benefit Plans [Abstract]
Current year actuarial gain	0.1	0.1
Amortization of actuarial (gain) loss	(0.3)	(0.3)
Total recognized in other comprehensive income	$ (0.2)	$ (0.2)