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Accumulated Other Comprehensive Loss - Summary (Details) $ in Millions	9 Months Ended
	Sep. 30, 2024 USD ($)
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	$ (151.8)
Other comprehensive (loss) income before reclassifications	(22.3)
Amounts reclassified from accumulated other comprehensive loss	181.2
Current period other comprehensive income	158.9
Ending balance	(202.2)
Total
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(2,800.3)
Ending balance	(2,641.4)
Translation Adjustments
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(912.8)
Other comprehensive (loss) income before reclassifications	16.5
Amounts reclassified from accumulated other comprehensive loss	1.0
Current period other comprehensive income	17.5
Ending balance	(895.3)
Postretirement Plans
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(1,887.5)
Other comprehensive (loss) income before reclassifications	(38.8)
Amounts reclassified from accumulated other comprehensive loss	180.2
Current period other comprehensive income	141.4
Ending balance	$ (1,746.1)

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Amount after tax, before reclassification adjustments, of other comprehensive income (loss), attributable to parent.

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