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Goodwill and Intangibles - Summary of Amortization Expense of Definite Lived Intangible Assets (Detail) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Sep. 30, 2016
Finite-Lived Intangible Assets [Line Items]          
Finite-Lived Intangible Assets, Accumulated Amortization $ 559.2   $ 559.2   $ 488.7
Amortization of intangibles     70.9 $ 70.5  
Finite-Lived Intangible Assets, Net 895.3   895.3   899.0
VOBA [Member]          
Finite-Lived Intangible Assets [Line Items]          
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months 93.0   93.0    
2014 90.8   90.8    
2015 90.5   90.5    
2016 89.0   89.0    
2017 83.9   83.9    
Finite-Lived Intangible Assets [Member]          
Finite-Lived Intangible Assets [Line Items]          
Amortization of intangibles 23.8 $ 23.5 70.9 $ 70.5  
Finite-Lived Intangible Assets, Net 895.3   895.3   899.0
Customer Relationships [Member]          
Finite-Lived Intangible Assets [Line Items]          
Finite-Lived Intangible Assets, Accumulated Amortization 344.3   344.3   302.9
Finite-Lived Intangible Assets, Net 657.3   657.3   681.9
Trade Names [Member]          
Finite-Lived Intangible Assets [Line Items]          
Finite-Lived Intangible Assets, Accumulated Amortization 100.8   100.8   89.1
Finite-Lived Intangible Assets, Net 64.9   64.9   76.6
Technology-Based Intangible Assets [Member]          
Finite-Lived Intangible Assets [Line Items]          
Finite-Lived Intangible Assets, Accumulated Amortization 114.1   114.1   96.7
Finite-Lived Intangible Assets, Net $ 173.1   $ 173.1   $ 140.5