Revenue from Contracts with Customers - Summary of Revenue disaggregated Based on Geographic Location (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Disaggregation Of Revenue [Line Items]
Total revenue	$ 704.7	$ 503.3	$ 2,105.0	$ 1,358.8
United States [Member]
Disaggregation Of Revenue [Line Items]
Total revenue	425.1	311.9	1,273.4	831.4
All Other Countries [Member]
Disaggregation Of Revenue [Line Items]
Total revenue	$ 279.6	$ 191.4	$ 831.6	$ 527.4