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Goodwill and Intangible Assets - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Mar. 31, 2017
Mar. 31, 2016
Goodwill and Intangible Assets Disclosure [Abstract]        
Amortization expense of intangible assets $ 12.4 $ 15.2 $ 24.9 $ 28.0
Remainder of Fiscal 2017 24.2   24.2  
Fiscal 2018 47.1   47.1  
Fiscal 2019 45.3   45.3  
Fiscal 2020 43.9   43.9  
Fiscal 2021 $ 42.0   $ 42.0