Accumulated Other Comprehensive (Loss) - Schedule of Changes in AOCI (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Accumulated Other Comprehensive Loss [Roll Forward]
Beginning balance	$ 2,010.3	$ 2,005.3	$ 2,058.0	$ 2,018.5
Other Comprehensive Income (Loss) before Reclassifications			(6.8)
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss)			121.0
Net Current-period Other Comprehensive Income (Loss)			114.2
Net Current-period Other Comprehensive Loss (Income) Attributable to Noncontrolling Interest	17.4	(8.1)	114.2	(2.1)
Ending balance	2,036.6	2,056.9	2,036.6	2,056.9
AOCI Attributable to Parent
Accumulated Other Comprehensive Loss [Roll Forward]
Beginning balance	(299.5)	(373.2)	(365.8)	(377.9)
Ending balance	(285.6)	$ (379.3)	(285.6)	$ (379.3)
Derivatives Instruments
Accumulated Other Comprehensive Loss [Roll Forward]
Beginning balance			(16.6)
Ending balance	(15.3)		(15.3)
Pension and Postretirement Benefit Plans
Accumulated Other Comprehensive Loss [Roll Forward]
Beginning balance			(238.5)
Ending balance	(124.9)		(124.9)
Currency Translation Adjustments
Accumulated Other Comprehensive Loss [Roll Forward]
Beginning balance			(110.7)
Ending balance	$ (145.4)		(145.4)
Derivatives Instruments
Accumulated Other Comprehensive Loss [Roll Forward]
Other Comprehensive Income (Loss) before Reclassifications			4.1
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss)			(2.5)
Net Current-period Other Comprehensive Income (Loss)			1.6
Pension and Postretirement Benefit Plans
Accumulated Other Comprehensive Loss [Roll Forward]
Other Comprehensive Income (Loss) before Reclassifications			32.0
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss)			123.5
Net Current-period Other Comprehensive Income (Loss)			155.5
Currency Translation Adjustments
Accumulated Other Comprehensive Loss [Roll Forward]
Other Comprehensive Income (Loss) before Reclassifications			(42.9)
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss)			0.0
Net Current-period Other Comprehensive Income (Loss)			(42.9)
Derivatives Instruments
Accumulated Other Comprehensive Loss [Roll Forward]
Net Current-period Other Comprehensive Loss (Income) Attributable to Noncontrolling Interest			(0.3)
Pension and Postretirement Benefit Plans
Accumulated Other Comprehensive Loss [Roll Forward]
Net Current-period Other Comprehensive Loss (Income) Attributable to Noncontrolling Interest			(41.9)
Currency Translation Adjustments
Accumulated Other Comprehensive Loss [Roll Forward]
Net Current-period Other Comprehensive Loss (Income) Attributable to Noncontrolling Interest			8.2
Total
Accumulated Other Comprehensive Loss [Roll Forward]
Net Current-period Other Comprehensive Loss (Income) Attributable to Noncontrolling Interest			$ (34.0)