Equity - Reclassification of AOCI (Details) - USD ($) $ in Millions	3 Months Ended				6 Months Ended
	Jun. 30, 2025	Mar. 31, 2025	Jun. 30, 2024	Mar. 31, 2024	Jun. 30, 2025	Jun. 30, 2024
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Currency exchange contracts	$ 365.1		$ 390.6		$ 649.1	$ 730.7
Natural gas contracts	(227.2)		(267.4)		(397.8)	(507.8)
Total before tax	(142.7)		(334.6)		(115.9)	(406.5)
(Provision) benefit for income taxes	(3.8)		50.9		(10.1)	66.8
Amount included in net income (loss)	(146.5)	$ 20.5	(283.7)	$ (56.0)	(126.0)	(339.7)
Derivative instruments | Reclassifications of accumulated other comprehensive income (loss)
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Total before tax	(0.1)		(0.8)		(0.3)	(1.5)
(Provision) benefit for income taxes	0.0		0.2		0.1	0.4
Amount included in net income (loss)	(0.1)		(0.6)		(0.2)	(1.1)
Currency exchange contracts | Derivative instruments | Reclassifications of accumulated other comprehensive income (loss)
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Currency exchange contracts	(0.2)		0.0		(0.2)	0.0
Natural gas contracts | Derivative instruments | Reclassifications of accumulated other comprehensive income (loss)
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Natural gas contracts	$ 0.1		$ (0.8)		$ (0.1)	$ (1.5)