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Equity, Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Increase (Decrease) In Accumulated Other Comprehensive Income (Loss)      
Balance at beginning of period $ 4,530.3    
Reclassification of the stranded tax effects of the Tax Act     $ 0.0
Balance at end of period 5,384.9 $ 4,530.3  
Accumulated Other Comprehensive Loss      
Increase (Decrease) In Accumulated Other Comprehensive Income (Loss)      
Balance at beginning of period (430.9) (390.2) (201.0)
Other comprehensive income (loss) before reclassification, net of tax 132.2 (56.0) (185.9)
Amounts reclassified from Accumulated other comprehensive income (loss) to earnings, net of tax 20.6 15.3 20.2
Reclassification of the stranded tax effects of the Tax Act     (23.5)
Balance at end of period (278.1) (430.9) (390.2)
Accumulated Other Comprehensive Loss | ASU 2018-02      
Increase (Decrease) In Accumulated Other Comprehensive Income (Loss)      
Reclassification of the stranded tax effects of the Tax Act     (23.5)
Foreign Currency Translation Adjustment      
Increase (Decrease) In Accumulated Other Comprehensive Income (Loss)      
Balance at beginning of period (237.9) (197.5) (33.2)
Other comprehensive income (loss) before reclassification, net of tax 151.3 (40.4) (164.3)
Amounts reclassified from Accumulated other comprehensive income (loss) to earnings, net of tax 0.0 0.0 0.0
Balance at end of period (86.6) (237.9) (197.5)
Foreign currency translation adjustments, tax 0.0 0.0 0.0
Foreign Currency Translation Adjustment | ASU 2018-02      
Increase (Decrease) In Accumulated Other Comprehensive Income (Loss)      
Reclassification of the stranded tax effects of the Tax Act     0.0
Unrealized Gain (Loss) on Hedging Activities      
Increase (Decrease) In Accumulated Other Comprehensive Income (Loss)      
Balance at beginning of period 0.3 0.2 (0.2)
Other comprehensive income (loss) before reclassification, net of tax (0.2) 0.1 0.4
Amounts reclassified from Accumulated other comprehensive income (loss) to earnings, net of tax 0.0 0.0 0.0
Balance at end of period 0.1 0.3 0.2
Unrealized (gain) loss on hedging activities, tax 0.0 0.0 (0.1)
Unrealized Gain (Loss) on Hedging Activities | ASU 2018-02      
Increase (Decrease) In Accumulated Other Comprehensive Income (Loss)      
Reclassification of the stranded tax effects of the Tax Act     0.0
Defined Benefit Plan Liability Adjustment      
Increase (Decrease) In Accumulated Other Comprehensive Income (Loss)      
Balance at beginning of period (193.3) (192.9) (167.6)
Other comprehensive income (loss) before reclassification, net of tax (18.9) (15.7) (22.0)
Amounts reclassified from Accumulated other comprehensive income (loss) to earnings, net of tax 20.6 15.3 20.2
Balance at end of period (191.6) (193.3) (192.9)
Pension and postretirement benefit plan adjustment, tax 7.1 5.3 6.6
Amounts reclassified from Accumulated Other Comprehensive Income (Loss), tax $ (6.7) $ (4.9) (6.4)
Defined Benefit Plan Liability Adjustment | ASU 2018-02      
Increase (Decrease) In Accumulated Other Comprehensive Income (Loss)      
Reclassification of the stranded tax effects of the Tax Act     $ (23.5)