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Goodwill and Intangible Assets - Schedule of Changes in Goodwill (Detail) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Mar. 31, 2021
Dec. 31, 2020
Goodwill And Intangible Assets Disclosure [Abstract]    
Balance $ 2,031.8 $ 1,973.5
Acquisition 275.7 42.7
Translation 4.0 15.6
Balance $ 2,311.5 $ 2,031.8