Stockholders' Equity Accumulated Other comprehensive Income (Loss) - Changes in Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Defined Benefit Plan, Accumulated Other Comprehensive Income (Loss), after Tax [Roll Forward]
Accumulated other comprehensive loss at beginning of period	$ (2.8)	$ (1.4)
Other Comprehensive Income (Loss), before Reclassifications, before Tax	2.4	(1.0)
Amounts reclassified from accumulated other comprehensive income/(loss)	(1.3)	(0.4)
Net current-period other comprehensive income/(loss)	1.1	(1.4)
Accumulated other comprehensive loss at end of period	(1.7)	(2.8)	$ (1.4)
AOCI Changes For Defined Benefit Pension And Postretirement Plans [Member]
Defined Benefit Plan, Accumulated Other Comprehensive Income (Loss), after Tax [Roll Forward]
Accumulated other comprehensive loss at beginning of period	(2.6)	(2.5)
Other Comprehensive Income (Loss), before Reclassifications, before Tax	0.5	(0.1)
Amounts reclassified from accumulated other comprehensive income/(loss)	0.0	0.0
Net current-period other comprehensive income/(loss)	0.5	(0.1)
Accumulated other comprehensive loss at end of period	(2.1)	(2.6)	(2.5)
Accumulated (Gain) Loss from Commodity Contracts Cash Flows Hedges [Member]
Defined Benefit Plan, Accumulated Other Comprehensive Income (Loss), after Tax [Roll Forward]
Accumulated other comprehensive loss at beginning of period	(0.3)	1.1
Other Comprehensive Income (Loss), before Reclassifications, before Tax	1.4	(1.4)
Amounts reclassified from accumulated other comprehensive income/(loss)	(0.7)	0.0	(2.5)
Net current-period other comprehensive income/(loss)	0.7	(1.4)
Accumulated other comprehensive loss at end of period	0.4	(0.3)	1.1
Accumulated (Gain) Loss from Interest Rate Swap Cash Flows Hedges
Defined Benefit Plan, Accumulated Other Comprehensive Income (Loss), after Tax [Roll Forward]
Accumulated other comprehensive loss at beginning of period	0.1	0.0
Other Comprehensive Income (Loss), before Reclassifications, before Tax	0.5	0.5
Amounts reclassified from accumulated other comprehensive income/(loss)	(0.6)	(0.4)
Net current-period other comprehensive income/(loss)	(0.1)	0.1
Accumulated other comprehensive loss at end of period	$ 0.0	$ 0.1	$ 0.0