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Goodwill and Other Intangible Assets - Schedule of Goodwill and Intangible Assets (Details) - USD ($)
$ in Millions
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2015
Goodwill and Intangible Assets Disclosure [Abstract]      
Goodwill $ 1,687.2 $ 1,661.2 $ 1,661.2
Indefinite-lived intangible assets 534.0 530.9  
Definite-lived intangible assets, net 6.5 19.2  
Total $ 2,227.7 $ 2,211.3