Accumulated Other Comprehensive Income - Schedule of Accumulated Other Comprehensive Income (Details) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2025		Mar. 31, 2024
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	[1]	$ 743.1		$ 652.2
Other comprehensive income (loss), net of tax		2.6		(2.1)	[1]
Ending balance		756.8		714.7	[1]
Defined Benefit Plans:
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance		19.1		11.0
Less: income tax (expense) benefit	[2]	(0.1)		0.1
Other comprehensive income (loss), net of tax		0.1		(0.5)
Ending balance		19.2		10.5
Defined Benefit Plans: Net Actuarial Gain
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Reclassification from AOCI	[3]	(0.6)		(0.3)
Defined Benefit Plans: Net Prior Service Cost (Credit)
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Unrealized gain (loss) on cash flow hedges		(0.1)
Reclassification from AOCI	[3]	0.9		(0.3)
Cash Flow Hedges:
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance		1.4		2.1
Unrealized gain (loss) on cash flow hedges		8.7		(4.2)
Less: income tax (expense) benefit		(2.0)		1.0
Net unrealized gain (loss) on available for sale securities, cash flow hedges and fair value hedges		6.7		(3.2)
Reclassification from AOCI		(5.5)		2.1
Less: income tax (expense) benefit	[2]	1.3		(0.5)
Net (gain) loss reclassified from AOCI to Net income		(4.2)		1.6
Other comprehensive income (loss), net of tax		2.5		(1.6)
Ending balance	[4]	3.9		0.5
Accumulated Other Comprehensive Income (Loss)
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance		20.5	[1]	13.1
Other comprehensive income (loss), net of tax		2.6		(2.1)
Ending balance		$ 23.1		$ 11.0	[1]

[1] Adjusted to reflect the retrospective change in inventory valuation methodology from LIFO to WAC. See Note 14 for further discussion.

[2] Income tax amounts reclassified out of AOCI were included as a component of Income tax provision.

[3] Amounts amortized out of AOCI related to pension and other postretirement and postemployment benefits were included within Net periodic postretirement and postemployment benefit cost (see Note 3).

[4] As of March 31, 2025, we estimate a net mark-to-market gain before tax of $4.4 million in AOCI will be reclassified into Net income upon settlement within the next 12 months.