Summary of Significant Accounting Policies - Change In Accounting Principle Cash Flows (Details) - USD ($) $ in Millions	3 Months Ended				12 Months Ended
	Dec. 31, 2025	Sep. 30, 2025	Jun. 30, 2025	Mar. 31, 2025	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Net Income (Loss) Attributable to Parent	$ 142.5	$ 259.9	$ 273.9	$ 129.6	$ 805.8	$ 811.1	$ 591.2
Inventories					(228.2)	(15.6)	9.7
Deferred income taxes					20.2	(23.2)	(25.7)
As Reported
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Net Income (Loss) Attributable to Parent	139.7	245.8	277.6	120.3		806.9	590.1
Inventories						(10.1)	11.1
Deferred income taxes						(24.5)	(26.0)
Impact of LIFO Change
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Net Income (Loss) Attributable to Parent	$ (2.8)	$ 10.0	$ (2.6)	$ 5.5
Effect of Change
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Net Income (Loss) Attributable to Parent					$ 15.7	4.2	1.1
Inventories						(5.5)	(1.4)
Deferred income taxes						$ 1.3	$ 0.3