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Identifiable Intangible Assets (Narrative) (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2013
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2014
Amortization   $ 24.3 $ 29.4 $ 29.4
Software and Software Development Costs [Member]        
Finite-Lived Intangible Asset, Useful Life 3 years 6 years    
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life   3 years 7 months 3 days    
Amortization   $ 1.9 1.6 1.1
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months   2.8    
Finite-Lived Intangible Assets, Amortization Expense, Year Two   2.6    
Finite-Lived Intangible Assets, Amortization Expense, Year Three   2.4    
Finite-Lived Intangible Assets, Amortization Expense, Year Four   2.1    
Finite-Lived Intangible Assets, Amortization Expense, Year Five   $ 1.3    
Business Combination-Related Identifiable Intangible [Member]        
Finite-Lived Intangible Asset, Useful Life   7 years 2 months 2 days    
Amortization   $ 22.4 $ 27.8 $ 28.3
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months   22.3    
Finite-Lived Intangible Assets, Amortization Expense, Year Two   22.5    
Finite-Lived Intangible Assets, Amortization Expense, Year Three   22.3    
Finite-Lived Intangible Assets, Amortization Expense, Year Four   22.2    
Finite-Lived Intangible Assets, Amortization Expense, Year Five   $ 21.9