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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, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Sep. 30, 2015
Finite-Lived Intangible Assets [Line Items]          
Finite-Lived Intangible Assets, Accumulated Amortization $ 465.0   $ 465.0   $ 399.2
Amortization of intangibles 23.5 $ 22.3 70.5 $ 64.0  
Finite-Lived Intangible Assets, Net 920.7   920.7   990.0
VOBA [Member]          
Finite-Lived Intangible Assets [Line Items]          
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months 93.9   93.9    
2014 93.0   93.0    
2015 86.2   86.2    
2016 85.1   85.1    
2017 84.9   84.9    
Finite-Lived Intangible Assets [Member]          
Finite-Lived Intangible Assets [Line Items]          
Amortization of intangibles 23.5 $ 22.3 70.5 $ 64.0  
Finite-Lived Intangible Assets, Net 920.7   920.7   990.0
Customer Relationships [Member]          
Finite-Lived Intangible Assets [Line Items]          
Finite-Lived Intangible Assets, Accumulated Amortization 288.7   288.7   247.4
Finite-Lived Intangible Assets, Net 695.3   695.3   737.8
Trade Names [Member]          
Finite-Lived Intangible Assets [Line Items]          
Finite-Lived Intangible Assets, Accumulated Amortization 85.3   85.3   73.7
Finite-Lived Intangible Assets, Net 80.1   80.1   91.7
Technology-Based Intangible Assets [Member]          
Finite-Lived Intangible Assets [Line Items]          
Finite-Lived Intangible Assets, Accumulated Amortization 91.0   91.0   78.1
Finite-Lived Intangible Assets, Net $ 145.3   $ 145.3   $ 160.5