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Goodwill and Intangibles - Additional Information (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]          
Amortization of intangibles     $ 70.9 $ 70.5  
Finite-Lived Intangible Assets, Accumulated Amortization $ 559.2   559.2   $ 488.7
Finite-Lived Intangible Assets [Member]          
Finite-Lived Intangible Assets [Line Items]          
Amortization of intangibles 23.8 $ 23.5 70.9 $ 70.5  
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    
Trade Names [Member]          
Finite-Lived Intangible Assets [Line Items]          
Finite-Lived Intangible Assets, Accumulated Amortization $ 100.8   $ 100.8   $ 89.1
Minimum [Member] | Technology Assets [Member]          
Finite-Lived Intangible Assets [Line Items]          
Amortizable Life     5 years    
Minimum [Member] | Trade Names [Member]          
Finite-Lived Intangible Assets [Line Items]          
Amortizable Life     5 years    
Maximum [Member] | Technology Assets [Member]          
Finite-Lived Intangible Assets [Line Items]          
Amortizable Life     18 years    
Maximum [Member] | Trade Names [Member]          
Finite-Lived Intangible Assets [Line Items]          
Amortizable Life     13 years    
Weighted Average [Member] | Technology Assets [Member]          
Finite-Lived Intangible Assets [Line Items]          
Amortizable Life     11 years 7 months    
Weighted Average [Member] | Trade Names [Member]          
Finite-Lived Intangible Assets [Line Items]          
Amortizable Life     11 years 4 months 12 days