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Identifiable Intangible Assets (Narrative) (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended 12 Months Ended
Dec. 31, 2014
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2013
Amortization     $ 29.4 $ 29.4 $ 31.8
Software and Software Development Costs [Member]          
Finite-Lived Intangible Asset, Useful Life 3 years 6 years 4 years    
Amortization     $ 1.6 1.1 2.3
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months     2.3    
Finite-Lived Intangible Assets, Amortization Expense, Year Two     2.3    
Finite-Lived Intangible Assets, Amortization Expense, Year Three     2.1    
Finite-Lived Intangible Assets, Amortization Expense, Year Four     1.8    
Finite-Lived Intangible Assets, Amortization Expense, Year Five     $ 1.6    
Business Combination-Related Identifiable Intangible [Member]          
Finite-Lived Intangible Asset, Useful Life     8 years 1 month 2 days    
Amortization     $ 27.8 $ 28.3 $ 29.5
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months     22.3    
Finite-Lived Intangible Assets, Amortization Expense, Year Two     22.4    
Finite-Lived Intangible Assets, Amortization Expense, Year Three     22.5    
Finite-Lived Intangible Assets, Amortization Expense, Year Four     22.3    
Finite-Lived Intangible Assets, Amortization Expense, Year Five     $ 22.2