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Accumulated Other Comprehensive Loss - Summary (Details) $ in Millions	6 Months Ended
	Jun. 30, 2024 USD ($)
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	$ (151.8)
Other comprehensive (loss) income before reclassifications	(34.8)
Amounts reclassified from accumulated other comprehensive loss	165.1
Current period other comprehensive income (loss)	130.3
Ending balance	(174.1)
Total
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(2,800.3)
Ending balance	(2,670.0)
Translation Adjustments
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(912.8)
Other comprehensive (loss) income before reclassifications	(36.4)
Amounts reclassified from accumulated other comprehensive loss	1.7
Current period other comprehensive income (loss)	(34.7)
Ending balance	(947.5)
Postretirement Plans
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(1,887.5)
Other comprehensive (loss) income before reclassifications	1.6
Amounts reclassified from accumulated other comprehensive loss	163.4
Current period other comprehensive income (loss)	165.0
Ending balance	$ (1,722.5)

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