Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance	$ (1,150.0)
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Reclassification Adjustment from AOCI, Realized upon Sale or Liquidation, before Tax	0.0	$ (6.0)	$ 0.0
Balance	(1,162.2)	(1,150.0)
Income tax benefit (expense)	233.7	225.2	(204.6)
Foreign currency translation adjustments
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance	(758.7)	(408.5)	(972.0)
Foreign currency translation adjustments	129.3	(411.6)	638.3
Other Comprehensive Income (Loss), Net Investment Hedge, Gain (Loss), before Reclassification and Tax	50.3	106.4	(182.6)
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Reclassification Adjustment from AOCI, Realized upon Sale or Liquidation, before Tax		6.0
Unrealized gain (loss) on derivative instruments	0.0	0.0	0.0
Reclassification of derivative (gain) loss to income	0.0	0.0	0.0
Pension and other postretirement benefit adjustments	0.0	0.0	0.0
Amortization of net prior service (benefit) cost and net actuarial (gain) loss to income	0.0	0.0	0.0
Ownership share of unconsolidated subsidiaries' other comprehensive income (loss)	0.0	0.0	0.0
Tax benefit (expense)	(0.1)	(51.0)	107.8
Balance	(652.5)	(758.7)	(408.5)
Gain (loss) on derivative instruments
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance	(0.3)	(13.5)	2.6
Foreign currency translation adjustments	0.0	0.0	0.0
Other Comprehensive Income (Loss), Net Investment Hedge, Gain (Loss), before Reclassification and Tax	0.0	0.0	0.0
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Reclassification Adjustment from AOCI, Realized upon Sale or Liquidation, before Tax		0.0
Unrealized gain (loss) on derivative instruments	(111.3)	14.5	(22.7)
Reclassification of derivative (gain) loss to income	0.6	3.4	2.0
Pension and other postretirement benefit adjustments	0.0	0.0	0.0
Amortization of net prior service (benefit) cost and net actuarial (gain) loss to income	0.0	0.0	0.0
Ownership share of unconsolidated subsidiaries' other comprehensive income (loss)	0.0	0.0	0.0
Tax benefit (expense)	27.0	(4.7)	4.6
Balance	(87.8)	(0.3)	(13.5)
Gain (loss) on derivative instruments | Reclassification out of Accumulated Other Comprehensive Income
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Income tax benefit (expense)	(0.1)	(0.9)	(0.7)
Pension and Postretirement Benefit adjustments
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance	(330.7)	(378.5)	(532.5)
Foreign currency translation adjustments	(2.5)	(0.6)	4.7
Other Comprehensive Income (Loss), Net Investment Hedge, Gain (Loss), before Reclassification and Tax	0.0	0.0	0.0
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Reclassification Adjustment from AOCI, Realized upon Sale or Liquidation, before Tax		0.0
Unrealized gain (loss) on derivative instruments	0.0	0.0	0.0
Reclassification of derivative (gain) loss to income	0.0	0.0	0.0
Pension and other postretirement benefit adjustments	(43.7)	55.4	181.8
Amortization of net prior service (benefit) cost and net actuarial (gain) loss to income	26.5	6.5	4.4
Ownership share of unconsolidated subsidiaries' other comprehensive income (loss)	0.0	0.0	0.0
Tax benefit (expense)	(2.9)	(13.5)	(36.9)
Balance	(351.0)	(330.7)	(378.5)
Pension and Postretirement Benefit adjustments | Reclassification out of Accumulated Other Comprehensive Income
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Income tax benefit (expense)	(6.8)	(1.6)	(0.8)
Accumulated other comprehensive income (loss)
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance	(1,150.0)	(860.0)	(1,571.8)
Foreign currency translation adjustments	126.8	(412.2)	643.0
Other Comprehensive Income (Loss), Net Investment Hedge, Gain (Loss), before Reclassification and Tax	50.3	106.4	(182.6)
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Reclassification Adjustment from AOCI, Realized upon Sale or Liquidation, before Tax		6.0
Unrealized gain (loss) on derivative instruments	(111.3)	14.5	(22.7)
Reclassification of derivative (gain) loss to income	0.6	3.4	2.0
Pension and other postretirement benefit adjustments	(43.7)	55.4	181.8
Amortization of net prior service (benefit) cost and net actuarial (gain) loss to income	26.5	6.5	4.4
Ownership share of unconsolidated subsidiaries' other comprehensive income (loss)	(14.4)	(1.0)	14.3
Tax benefit (expense)	27.8	(69.0)	71.6
Balance	(1,162.2)	(1,150.0)	(860.0)
Equity Method Investments
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance	(60.3)	(59.5)	(69.9)
Foreign currency translation adjustments	0.0	0.0	0.0
Other Comprehensive Income (Loss), Net Investment Hedge, Gain (Loss), before Reclassification and Tax	0.0	0.0	0.0
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Reclassification Adjustment from AOCI, Realized upon Sale or Liquidation, before Tax		0.0
Unrealized gain (loss) on derivative instruments	0.0	0.0	0.0
Reclassification of derivative (gain) loss to income	0.0	0.0	0.0
Pension and other postretirement benefit adjustments	0.0	0.0	0.0
Amortization of net prior service (benefit) cost and net actuarial (gain) loss to income	0.0	0.0	0.0
Ownership share of unconsolidated subsidiaries' other comprehensive income (loss)	(14.4)	(1.0)	14.3
Tax benefit (expense)	3.8	0.2	(3.9)
Balance	(70.9)	$ (60.3)	(59.5)
Pension and Postretirement Benefit Adjustments [Member]
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	(22.6)
Other Comprehensive Income (Loss), Reclassification Of Stranded Tax Effects	2.3
Gain (Loss) on Derivative Instruments [Member]
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	(83.7)
Other Comprehensive Income (Loss), Reclassification Of Stranded Tax Effects	(3.8)
Foreign Currency Translation Adjustments [Member]
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	179.5
Other Comprehensive Income (Loss), Reclassification Of Stranded Tax Effects	(73.3)
Accumulated other comprehensive income (loss)
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	62.6
Other Comprehensive Income (Loss), Reclassification Of Stranded Tax Effects	(74.8)
Equity Method Investments
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	(10.6)
Other Comprehensive Income (Loss), Reclassification Of Stranded Tax Effects	$ 0.0
Scenario, Adjustment
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Unrealized gain (loss) on derivative instruments			$ 116.0