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Accumulated Other Comprehensive Income (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Accumulated other comprehensive loss $ (1,806.2) $ (1,598.2) $ (1,657.1) $ (1,061.6)
Other Comprehensive Income (Loss), Before Tax (215.3) 64.1 (622.5)  
Other Comprehensive Income (Loss), Tax 0.1 (6.4) 21.8  
Net Gain (Loss) on Marketable Securities Held in Trust, After Reclassification and Tax 12.8 10.9 4.6  
Other Comprehensive Income (Loss), Net of Tax (215.2) 57.7 (600.7)  
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Noncontrolling Interest 7.2 1.2 5.2  
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-sale, Parent        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Accumulated other comprehensive loss 18.9 6.1 (4.8) (9.4)
Net Unrealized Holding Gain (Loss) on Marketable Securities Held in Trust, Before Tax 16.6 14.0 4.8  
Net Gain (Loss) on Marketable Securities Held in Trust, Tax (3.8) (3.1) (0.2)  
Net Gain (Loss) on Marketable Securities Held in Trust, After Reclassification and Tax 12.8 10.9 4.6  
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Noncontrolling Interest 0.0 0.0 0.0  
AOCI, Derivative Qualifying as Hedge, Excluded Component, Parent        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Accumulated other comprehensive loss 3.7 2.1 0.4 (1.8)
Net Gain (Loss) on Interest Rate Swaps Qualifying as Hedge, After Reclassification, Before Tax 2.0 2.2 2.3  
Gain (Loss) on Interest Rate Swaps Qualifying as Hedge, Tax (0.4) (0.5) (0.1)  
Net Gain (Loss) on Interest Rate Swaps Qualifying as Hedge, After Reclassification and Tax 1.6 1.7 2.2  
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Noncontrolling Interest 0.0 0.0 0.0  
Accumulated Defined Benefit Plans Adjustment Attributable to Parent        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Accumulated other comprehensive loss (109.7) (129.6) (105.3) (94.7)
Net Actuarial Gain (Loss), After Reclassification, Before Tax 12.2 (26.2) (8.2)  
Other Comprehensive Income (Loss), Tax 7.7 1.9 (2.4)  
Net Actuarial Gain (Loss), After Reclassification and Tax 19.9 (24.3) (10.6)  
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Noncontrolling Interest 0.0 0.0 0.0  
Accumulated Foreign Currency Adjustment Attributable to Parent        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Accumulated other comprehensive loss (1,719.1) (1,476.8) (1,547.4) $ (955.7)
Foreign Currency Translation Gain (Loss), Before Tax (246.1) 74.1 (621.4)  
Foreign Currency Translation Adjustment, Tax (Expense) Benefit (3.4) (4.7) 24.5  
Foreign Currency Translation Gain (Loss), Net of Tax (249.5) 69.4 (596.9)  
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Noncontrolling Interest $ 7.2 $ 1.2 $ 5.2