Revenue from Contracts with Customers - Summary of Revenue disaggregated Based on Geographic Location (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Disaggregation Of Revenue [Line Items]
Total revenue	$ 720.0	$ 451.7	$ 1,400.3	$ 855.4
Total revenue	720.0	451.7	1,400.3	855.4
United States [Member]
Disaggregation Of Revenue [Line Items]
Total revenue	436.2	276.2	848.3	519.4
Total revenue	436.2	276.2	848.3	519.4
All Other Countries [Member]
Disaggregation Of Revenue [Line Items]
Total revenue	283.8	175.5	552.0	336.0
Total revenue	$ 283.8	$ 175.5	$ 552.0	$ 336.0