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Goodwill And Intangible Assets (Changes To Intangible Assets) (Detail) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Mar. 31, 2020
Dec. 31, 2019
Dec. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract]      
Finite and Indefinite-lived intangible assets acquired $ 52.5 $ 66.0  
Amortization expense (11.0) (40.0)  
Finite Lived Intangible Assets, Foreign Currency Translation Gain (Loss) (1.2) (2.7)  
Balance at end of period, net of accumulated amortization 545.4    
Intangible assets, net 545.4 505.1 $ 481.8
Intangibles with indefinite useful lives $ 69.4 $ 69.9