Goodwill and Other Intangible Assets - Other Intangible Assets, Changes in Net Carrying Amount (Detail) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Jun. 30, 2020	Dec. 31, 2021	Dec. 31, 2020
Gross Amount
Other intangible assets, beginning		$ 807.1	$ 956.8
Finite-Lived Intangible Assets, Disposal of Intangible Assets		(25.8)	(41.7)
Currency translation effect on foreign balances		(1.1)	0.9
Goodwill, Impairment Loss	$ (108.9)		(108.9)
Other intangible assets, ending		780.2	807.1
Accumulated Amortization
Other intangible assets, beginning		(120.7)	(126.5)
Amortization of Intangible Assets, Adjustment for Disposal		20.7	41.7
Amortization expense		(34.0)	(36.1)
Currency translation effect on foreign balances		0.0	0.2
Other intangible assets, ending		$ (134.0)	$ (120.7)