Goodwill And Intangible Assets (Changes To Intangible Assets) (Detail) - USD ($) $ in Millions	6 Months Ended	12 Months Ended
	Jun. 30, 2021	Dec. 31, 2020
Goodwill and Intangible Assets Disclosure [Abstract]
Intangibles with indefinite useful lives	$ 71.2	$ 70.9
Balance at beginning of period, net of accumulated amortization	519.1	503.7
Finite and Indefinite-lived intangible assets acquired	0.0	52.5
Amortization expense	(22.6)	(48.3)
Currency translation	(5.2)	11.2
Balance at end of period, net of accumulated amortization	$ 491.3	$ 519.1