Accrued Liabilities and Other - Components of Accrued Liabilities and Other (Detail) - USD ($) $ in Millions	Dec. 31, 2020	Jan. 01, 2020	Dec. 31, 2019
Accrued Liabilities Current [Abstract]
Employee-related liabilities	$ 145.1		$ 155.6
Deferred revenue	15.6	$ 18.9	18.9
Restructuring liabilities and MEPP	33.3		14.8
Other	157.2		122.0
Total accrued liabilities and other	$ 351.2		$ 311.3