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Goodwill and Intangibles - Summary of Amortization Expense of Definite Lived Intangible Assets (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]          
Finite-Lived Intangible Assets, Accumulated Amortization $ 532.0   $ 532.0   $ 488.7
Amortization of intangibles     47.1 $ 47.0  
Finite-Lived Intangible Assets, Net 848.7   848.7   899.0
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    
Finite-Lived Intangible Assets [Member]          
Finite-Lived Intangible Assets [Line Items]          
Amortization of intangibles 23.5 $ 23.4 47.1 $ 47.0  
Finite-Lived Intangible Assets, Net 848.7   848.7   899.0
Customer Relationships [Member]          
Finite-Lived Intangible Assets [Line Items]          
Finite-Lived Intangible Assets, Accumulated Amortization 327.2   327.2   302.9
Finite-Lived Intangible Assets, Net 649.6   649.6   681.9
Trade Names [Member]          
Finite-Lived Intangible Assets [Line Items]          
Finite-Lived Intangible Assets, Accumulated Amortization 96.9   96.9   89.1
Finite-Lived Intangible Assets, Net 68.8   68.8   76.6
Technology-Based Intangible Assets [Member]          
Finite-Lived Intangible Assets [Line Items]          
Finite-Lived Intangible Assets, Accumulated Amortization 107.9   107.9   96.7
Finite-Lived Intangible Assets, Net $ 130.3   $ 130.3   $ 140.5