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Accumulated Other Comprehensive Income (Loss) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Dec. 31, 2019
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Accumulated other comprehensive loss $ (1,923.5) $ (2,184.0) $ (1,806.2) $ (1,598.2)
Other Comprehensive Income (Loss), Tax (130.4) (577.7)    
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) Arising During Period, after Tax 10.8 (15.4)    
OCI, Debt Securities, Available-for-Sale, Unrealized Holding Gain (Loss), before Adjustment, after Tax (17.8) 8.0    
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Noncontrolling Interest (119.6) (593.1)    
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Noncontrolling Interest 2.3 7.3    
Accumulated Foreign Currency Adjustment Attributable to Parent [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Accumulated other comprehensive loss (1,822.9) (2,072.9) (1,719.1) (1,476.8)
Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Tax (114.4) (595.9)    
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Gain (Loss) Arising During Period, Net of Tax 8.3 (7.5)    
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Gain (Loss) Arising During Period, Net of Tax (106.1) (603.4)    
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Noncontrolling Interest 2.3 7.3    
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Accumulated other comprehensive loss (105.9) (127.8) (109.7) (129.6)
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) Arising During Period, before Tax 1.3 9.7    
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) Arising During Period, after Tax 2.5 (7.9)    
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) Arising During Period, after Tax 3.8 1.8    
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Noncontrolling Interest 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 4.2 2.6 3.7 2.1
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification and Tax 0.5 0.5    
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification and Tax 0.0 0.0    
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Tax 0.5 0.5    
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Noncontrolling Interest 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 1.1 14.1 $ 18.9 $ 6.1
Net (loss) gain on marketable securities held in trust fund, net of tax 0.0 0.0    
OCI, Debt Securities, Available-for-Sale, Unrealized Holding Gain (Loss), before Adjustment, after Tax (17.8) 8.0    
Other Comprehensive Income (Loss), Securities, Available-for-sale, Tax (17.8) 8.0    
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Noncontrolling Interest $ 0.0 $ 0.0