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Intangible Assets - Accumulated Impairment, Changes in Goodwill and Other Indefinite-Lived Intangibles (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2012
Intangible Assets      
Goodwill, Accumulated impairment loss     $ 606.3
Other indefinite-lived intangible assets, Accumulated impairment loss     $ 37.1
Summary of the changes in the carrying amount of goodwill and other indefinite-lived intangible assets      
Goodwill, Beginning balance $ 1,911.0 $ 1,752.0  
Goodwill, Additions   146.6  
Goodwill, Disposals (8.8) (3.9)  
Goodwill, Foreign currency translation 26.2 16.3  
Goodwill, Ending balance 1,928.4 1,911.0  
Other indefinite-lived intangible assets, Beginning Balance 552.2 486.2  
Other indefinite-lived intangible assets, Additions 2.5 67.4  
Other indefinite-lived intangible assets, Disposals   (1.2)  
Other indefinite-lived intangible assets, Impairment (1.2) (1.9)  
Other indefinite-lived intangible assets, Foreign currency translation 9.9 1.7  
Other indefinite-lived intangible assets, Ending Balance $ 563.4 $ 552.2