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Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Jun. 30, 2020
Dec. 31, 2019
Jun. 30, 2019
Dec. 31, 2018
Accumulated Other Comprehensive Income (Loss) [Line Items]                
Accumulated other comprehensive loss $ (2,053.8) $ (1,665.4) $ (2,053.8) $ (1,665.4) $ (2,113.2) $ (1,598.2) $ (1,477.9) $ (1,657.1)
Other Comprehensive Income (Loss), Tax 50.6 (186.4) (455.0) 3.5        
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) Arising During Period, after Tax 8.1 (3.6) (9.9) (14.0)        
OCI, Debt Securities, Available-for-Sale, Unrealized Holding Gain (Loss), before Adjustment, after Tax (2.3) (6.4) 13.6 15.3        
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Noncontrolling Interest 58.7 (190.0) (464.9) (10.5)        
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Noncontrolling Interest 0.7 2.5 9.3 2.2        
Accumulated Foreign Currency Adjustment Attributable to Parent [Member]                
Accumulated Other Comprehensive Income (Loss) [Line Items]                
Accumulated other comprehensive loss (1,955.9) (1,572.8) (1,955.9) (1,572.8) (2,016.3) (1,476.8) (1,388.7) (1,547.4)
Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Tax 50.5 (183.1) (488.9) (22.2)        
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Gain (Loss) Arising During Period, Net of Tax 9.2 (3.5) 0.5 (5.4)        
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Gain (Loss) Arising During Period, Net of Tax 59.7 (186.6) (488.4) (27.6)        
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Noncontrolling Interest 0.7 2.5 9.3 2.2        
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]                
Accumulated Other Comprehensive Income (Loss) [Line Items]                
Accumulated other comprehensive loss (120.9) (105.1) (120.9) (105.1) (121.8) (129.6) (107.6) (105.3)
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) Arising During Period, before Tax 2.7 2.7 15.0 7.9        
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) Arising During Period, after Tax (1.8) (0.2) (6.3) (7.7)        
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) Arising During Period, after Tax 0.9 2.5 8.7 0.2        
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Noncontrolling Interest 0.0 0.0 0.0 0.0        
AOCI, Derivative Qualifying as Hedge, Excluded Component, Noncontrolling Interest [Member]                
Accumulated Other Comprehensive Income (Loss) [Line Items]                
Accumulated other comprehensive loss 3.3 2.0 3.3 2.0 2.9 2.1 1.5 0.4
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification and Tax 0.4 0.5 1.2 1.6        
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification and Tax (0.1) (0.1) (0.3) (0.2)        
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Tax 0.5 0.6 1.5 1.8        
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Noncontrolling Interest 0.0 0.0 0.0 0.0        
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-sale, Parent [Member]                
Accumulated Other Comprehensive Income (Loss) [Line Items]                
Accumulated other comprehensive loss 19.7 10.5 19.7 10.5 $ 22.0 $ 6.1 $ 16.9 $ (4.8)
Net (loss) gain on marketable securities held in trust fund, net of tax 0.8 0.2 (3.8) (0.7)        
OCI, Debt Securities, Available-for-Sale, Unrealized Holding Gain (Loss), before Adjustment, after Tax (2.3) (6.4) 13.6 15.3        
Other Comprehensive Income (Loss), Securities, Available-for-sale, Tax (3.1) (6.6) 17.4 16.0        
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Noncontrolling Interest $ 0.0 $ 0.0 $ 0.0 $ 0.0