Other Assets, net - Components of Other Assets (Parenthetical) (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Intangible Assets Net Excluding Goodwill [Abstract]
Amortization expense	$ 3.3	$ 4.3	$ 7.1	$ 9.3