Stockholders' Equity Accumulated Other Comprehensive Income (loss) - Reclassifications of Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Amortization of defined benefit pension and postretirement plan items:
Total before income taxes	$ 161.8	$ 115.3	$ 123.6
Income tax benefit	(43.2)	(28.1)	(33.8)
Accumulated other comprehensive loss	(1.7)	(2.8)	(1.4)
Other Comprehensive Income (Loss), before Reclassifications, before Tax	2.4	(1.0)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	(1.3)	(0.4)
Other Comprehensive Income (Loss), Net of Tax	1.1	(1.4)
Accumulated (Gain) Loss from Commodity Contracts Cash Flows Hedges [Member]
Amortization of defined benefit pension and postretirement plan items:
Accumulated other comprehensive loss	0.4	(0.3)	1.1
Other Comprehensive Income (Loss), before Reclassifications, before Tax	1.4	(1.4)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	(0.7)	0.0	(2.5)
Other Comprehensive Income (Loss), Net of Tax	0.7	(1.4)
Accumulated (Gain) Loss from Interest Rate Swap Cash Flows Hedges
Amortization of defined benefit pension and postretirement plan items:
Accumulated other comprehensive loss	0.0	0.1	0.0
Other Comprehensive Income (Loss), before Reclassifications, before Tax	0.5	0.5
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	(0.6)	(0.4)
Other Comprehensive Income (Loss), Net of Tax	(0.1)	0.1
AOCI Changes For Defined Benefit Pension And Postretirement Plans [Member]
Amortization of defined benefit pension and postretirement plan items:
Accumulated other comprehensive loss	(2.1)	(2.6)	$ (2.5)
Other Comprehensive Income (Loss), before Reclassifications, before Tax	0.5	(0.1)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	0.0	0.0
Other Comprehensive Income (Loss), Net of Tax	$ 0.5	$ (0.1)