Lease Commitments - Lease Cost Components (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Leases [Abstract]
Operating Lease Cost	$ 96.2	$ 119.4
Variable Lease Cost	37.3	32.7
Sublease Income	(4.5)	(4.8)
Total Lease Cost	$ 129.0	$ 147.3