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Goodwill and Intangibles - Summary of Amortization Expense of Definite Lived Intangible Assets (Detail) - USD ($)
$ in Millions
 3 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Sep. 30, 2016
Finite-Lived Intangible Assets [Line Items]      
Finite-Lived Intangible Assets, Accumulated Amortization $ 508.5   $ 488.7
Amortization of intangibles 23.6 $ 23.6  
Finite-Lived Intangible Assets, Net 868.3   899.0
VOBA [Member]      
Finite-Lived Intangible Assets [Line Items]      
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months 91.9    
2014 85.7    
2015 85.4    
2016 85.2    
2017 81.9    
Finite-Lived Intangible Assets [Member]      
Finite-Lived Intangible Assets [Line Items]      
Amortization of intangibles 23.6    
Finite-Lived Intangible Assets, Net 868.3   899.0
Customer Relationships [Member]      
Finite-Lived Intangible Assets [Line Items]      
Finite-Lived Intangible Assets, Accumulated Amortization 313.2   302.9
Finite-Lived Intangible Assets, Net 660.1   681.9
Trade Names [Member]      
Finite-Lived Intangible Assets [Line Items]      
Finite-Lived Intangible Assets, Accumulated Amortization 93.0   89.1
Finite-Lived Intangible Assets, Net 72.7   76.6
Technology-Based Intangible Assets [Member]      
Finite-Lived Intangible Assets [Line Items]      
Finite-Lived Intangible Assets, Accumulated Amortization 102.3   96.7
Finite-Lived Intangible Assets, Net $ 135.5   $ 140.5