Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance	$ 13,673.1	$ 13,735.8	$ 13,187.3
Balance	12,621.3	13,673.1	13,735.8
Foreign currency translation adjustments
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance	(652.5)	(758.7)	(408.5)
Reclassification of derivative (gain) loss to income			(6.0)
Tax benefit (expense)	30.5	(0.1)	(51.0)
Balance	(539.5)	(652.5)	(758.7)
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, before Tax	196.0	129.3	(411.6)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax		179.5
Other Comprehensive Income (Loss), Reclassification Of Stranded Tax Effects		(73.3)
Pension and postretirement benefit adjustments
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance	(351.0)	(330.7)	(378.5)
Reclassification of derivative (gain) loss to income	(52.9)	(43.7)	55.4
Amortization of net prior service (benefit) cost and net actuarial (gain) loss to income and settlement	7.6	(26.5)	(6.5)
Tax benefit (expense)	15.4	(2.9)	(13.5)
Balance	(397.7)	(351.0)	(330.7)
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, before Tax	(1.6)	(2.5)	(0.6)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax		(22.6)
Other Comprehensive Income (Loss), Reclassification Of Stranded Tax Effects		2.3
Accumulated other comprehensive income (loss)
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance	(1,162.2)	(1,150.0)	(860.0)
Tax benefit (expense)	68.6	27.8	(69.0)
Balance	(1,167.8)	(1,162.2)	(1,150.0)
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, before Tax	194.4	126.8	(412.2)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax		62.6
Other Comprehensive Income (Loss), Reclassification Of Stranded Tax Effects		(74.8)
AOCI, Equity Method Investments
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Unrealized gain (loss) on derivative instruments	19.4	(14.4)	(1.0)
AOCI, Net Investment Hedges
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Unrealized gain (loss) on derivative instruments	(113.5)	50.3	106.4
Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance	(87.8)	(0.3)	(13.5)
Unrealized gain (loss) on derivative instruments	(113.5)	(111.3)	14.5
Reclassification of derivative (gain) loss to income	(0.5)	0.6	3.4
Tax benefit (expense)	27.9	27.0	(4.7)
Balance	(173.9)	(87.8)	(0.3)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax		(83.7)
Other Comprehensive Income (Loss), Reclassification Of Stranded Tax Effects		(3.8)
Equity Method Investments
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance	(70.9)	(60.3)	(59.5)
Unrealized gain (loss) on derivative instruments	19.4	(14.4)	(1.0)
Tax benefit (expense)	(5.2)	3.8	0.2
Balance	$ (56.7)	(70.9)	$ (60.3)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax		(10.6)
Other Comprehensive Income (Loss), Reclassification Of Stranded Tax Effects		$ 0.0