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Goodwill And Intangible Assets (Changes To Intangible Assets) (Detail) - USD ($)
$ in Millions
9 Months Ended 12 Months Ended
Sep. 30, 2019
Dec. 31, 2018
Dec. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract]      
Finite and Indefinite-lived intangible assets acquired $ 0.0 $ 252.8  
Amortization expense (30.6) (44.5)  
Finite Lived Intangible Assets, Foreign Currency Translation Gain (Loss) (5.8) (3.3)  
Balance at end of period, net of accumulated amortization 445.4    
Intangible assets, net $ 445.4 $ 481.8 $ 276.8