Accumulated Other Comprehensive Income (Loss) (Details) $ in Millions	9 Months Ended
	Sep. 30, 2020 USD ($)
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	$ 13,673.1
Ending balance	13,775.6
Foreign currency translation adjustments
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	(652.5)
Other comprehensive income (loss)	(56.6)
Tax benefit (expense)	7.4
Ending balance	(756.2)
Net investment hedges
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Other comprehensive income (loss)	(54.5)
Gain (loss) on derivative instruments
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	(87.8)
Other comprehensive income (loss)	(151.5)
Reclassification of derivative (gain) loss to income)	(1.2)
Tax benefit (expense)	37.7
Ending balance	(202.8)
Pension and postretirement benefit adjustments
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	(351.0)
Other comprehensive income (loss)	(6.2)
Tax benefit (expense)	1.5
Ending balance	(355.7)
Equity method investments
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	(70.9)
Other comprehensive income (loss)	3.0
Tax benefit (expense)	(0.8)
Ending balance	(68.7)
Accumulated other comprehensive income (loss)
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	(1,162.2)
Tax benefit (expense)	45.8
Ending balance	$ (1,383.4)