Fair Value Measurements - Fair Value Liabilities Measured on Recurring Basis Related to Continuing Operations (Detail) - Fair Value Measurements at Reporting Date Using: Significant Unobservable Inputs (Level 3) [Member] - Fair Value, Measurements, Recurring [Member] $ in Millions	6 Months Ended
	Jun. 30, 2022 USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Beginning balance December 31, 2021	$ 35.6
Change in estimates	(7.7)
Settlements	(6.5)
Ending balance June 30, 2022	$ 21.4