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Accumulated Other Comprehensive Loss - Summary (Details) $ in Millions	9 Months Ended
	Sep. 30, 2023 USD ($)
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	$ (14.7)
Other comprehensive (loss) income before reclassifications	(2.4)
Amounts reclassified from accumulated other comprehensive loss	236.4
Current period other comprehensive income	234.0
Ending balance	(32.4)
Total
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(3,076.0)
Ending balance	(2,842.0)
Translation Adjustments
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(977.4)
Other comprehensive (loss) income before reclassifications	14.1
Amounts reclassified from accumulated other comprehensive loss	(2.9)
Current period other comprehensive income	11.2
Ending balance	(966.2)
Postretirement Plans
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(2,098.6)
Other comprehensive (loss) income before reclassifications	(16.5)
Amounts reclassified from accumulated other comprehensive loss	239.3
Current period other comprehensive income	222.8
Ending balance	$ (1,875.8)

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