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Goodwill and Intangibles - Additional Information (Detail) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Mar. 31, 2017
Mar. 31, 2016
Sep. 30, 2016
Finite-Lived Intangible Assets [Line Items]          
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent     35.00%    
Amortization of intangibles     $ 47.1 $ 47.0  
Finite-Lived Intangible Assets, Accumulated Amortization $ 532.0   532.0   $ 488.7
Finite-Lived Intangible Assets [Member]          
Finite-Lived Intangible Assets [Line Items]          
Amortization of intangibles 23.5 $ 23.4 47.1 $ 47.0  
VOBA [Member]          
Finite-Lived Intangible Assets [Line Items]          
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months 91.9   91.9    
2014 85.7   85.7    
2015 85.4   85.4    
2016 85.2   85.2    
2017 81.9   81.9    
Trade Names [Member]          
Finite-Lived Intangible Assets [Line Items]          
Finite-Lived Intangible Assets, Accumulated Amortization $ 96.9   $ 96.9   $ 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 2 months 6 days    
Weighted Average [Member] | Trade Names [Member]          
Finite-Lived Intangible Assets [Line Items]          
Amortizable Life     11 years 4 months 12 days