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Capital Stock, Accumulated Other Comprehensive Loss and Equity - Summary of Changes in Accumulated Other Comprehensive Loss, Net of Tax (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]      
Balance at beginning of year $ 4,501.1 $ 4,360.6 $ 4,292.6
Balance at end of year 4,614.9 4,501.1 4,360.6
Defined benefit plans:      
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]      
Balance at beginning of year (217.6) (172.8) (184.0)
Reclassification adjustments (net of tax expense/benefit) 14.3 5.0 9.0
Other comprehensive income (loss) recognized during the period (73.6) (49.8) 2.2
Balance at end of year (276.9) (217.6) (172.8)
Comprehensive income (loss), tax      
Reclassification adjustments, tax expense (benefit) (4.7) (2.0) (2.4)
Other comprehensive income (loss), tax (expense) benefit 23.2 15.7 (0.6)
Derivative instruments and hedge activities:      
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]      
Balance at beginning of year 9.8 (9.7) (22.9)
Reclassification adjustments (net of tax expense/benefit) 7.5 (38.0) (15.2)
Other comprehensive income (loss) recognized during the period (4.7) 57.5 28.4
Balance at end of year 12.6 9.8 (9.7)
Comprehensive income (loss), tax      
Reclassification adjustments, tax expense (benefit) (1.8) 10.2 4.1
Other comprehensive income (loss), tax (expense) benefit 1.0 (15.7) (7.4)
Currency translation adjustments:      
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]      
Balance at beginning of year (564.9) (523.3) (306.5)
Other comprehensive income (loss) recognized during the period 124.1 (41.6) (216.8)
Balance at end of year (440.8) (564.9) (523.3)
Comprehensive income (loss), tax      
Other comprehensive income (loss), tax (expense) benefit $ 3.8 $ 0.9 $ 2.3