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Identifiable Intangible Assets (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 9 Months Ended 12 Months Ended
Dec. 31, 2013
Sep. 30, 2014
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2012
Indefinite-lived intangible assets:          
Intangible Assets, Gross (Excluding Goodwill)   $ 780.6 $ 780.6 $ 778.2  
Accumulated amortization:          
Accumulated amortization   (261.3) (261.3) (233.0)  
Net book value   533.6 533.6 553.1  
Goodwill   5.4 5.4 0  
Total intangible assets net book value   533.6 533.6 553.1  
Amortization     29.4 31.8 30.9
Business Combination-Related Identifiable Intangible [Member]
          
Accumulated amortization:          
Net book value   519.3 519.3 545.2  
Remaining weighted-average amortization period for the finite-lived intangible assets     9 years 1 month 7 days    
Amortization     28.3 29.5 29.4
Future Amortization Expense, 2014   27.7 27.7    
Future Amortization Expense, 2015   22.2 22.2    
Future Amortization Expense, 2016   22.2 22.2    
Future Amortization Expense, 2017   22.4 22.4    
Future Amortization Expense, 2018   22.3 22.3    
Trademarks and Trade Names [Member]
          
Indefinite-lived intangible assets:          
Trade names and trademarks   300.0 300.0 300.0  
Software and Software Development Costs [Member]
          
Capitalized external-use software:          
Software cost   14.3 14.3 12.2  
Software accumulated amortization   (5.4) (5.4) (4.3)  
Software net book value   8.9 8.9 7.9  
Accumulated amortization:          
Remaining weighted-average amortization period for the finite-lived intangible assets 3 years 6 years      
Capitalized software, weighted average remaining useful life     4 years 10 months    
Amortization     1.1 2.3 1.5
Future Amortization Expense, 2014   1.5 1.5    
Future Amortization Expense, 2015   1.8 1.8    
Future Amortization Expense, 2016   1.8 1.8    
Future Amortization Expense, 2017   1.5 1.5    
Future Amortization Expense, 2018   1.2 1.2    
Technology-Based Intangible Assets [Member]
          
Finite-Lived Intangible Assets, Net [Abstract]          
Technology intangible assets   80.4 80.4 80.1  
Accumulated amortization:          
Accumulated amortization   (68.1) (68.1) (61.5)  
Customer Relationships [Member]
          
Finite-Lived Intangible Assets, Net [Abstract]          
Customer relationships and other   400.2 400.2 398.1  
Accumulated amortization:          
Accumulated amortization   $ (193.2) $ (193.2) $ (171.5)