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Other Current Assets (Detail) - USD ($)
$ in Millions
Mar. 31, 2022
Dec. 31, 2021
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]    
Prepaid expenses $ 155.3 $ 136.2
Contract assets (Note 12) 5.6 5.2
Marketable securities (Note 4) 3.0 3.1
Other Assets, Miscellaneous, Current 118.5 87.1
Total other current assets $ 282.4 $ 231.6