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Acquisitions, Goodwill and Other Intangible Assets (Schedule of Intangible Assets) (Details) - USD ($)
$ in Millions
9 Months Ended 12 Months Ended
Sep. 30, 2015
Dec. 31, 2014
Finite-Lived Intangible Assets [Line Items]    
Gross $ 257.8 $ 263.9
Accumulated Amortization (180.7) (168.0)
Intangible assets, Net $ 77.1 $ 95.9
Weighted-Average Useful Life (years) 10 years 10 years
Intellectual Property [Member]    
Finite-Lived Intangible Assets [Line Items]    
Gross $ 28.1 $ 29.0
Accumulated Amortization (26.0) (25.0)
Intangible assets, Net $ 2.1 $ 4.0
Weighted-Average Useful Life (years) 9 years 9 years
Customer Related Assets [Member]    
Finite-Lived Intangible Assets [Line Items]    
Gross $ 137.7 $ 141.5
Accumulated Amortization (90.0) (83.6)
Intangible assets, Net $ 47.7 $ 57.9
Weighted-Average Useful Life (years) 12 years 12 years
Supplier Relationships [Member]    
Finite-Lived Intangible Assets [Line Items]    
Gross $ 0.2 $ 0.2
Accumulated Amortization (0.1) (0.1)
Intangible assets, Net $ 0.1 $ 0.1
Weighted-Average Useful Life (years) 20 years 20 years
Technology-Based Assets [Member]    
Finite-Lived Intangible Assets [Line Items]    
Gross $ 87.6 $ 88.8
Accumulated Amortization (62.4) (57.4)
Intangible assets, Net $ 25.2 $ 31.4
Weighted-Average Useful Life (years) 8 years 8 years
Non-competition Agreement [Member]    
Finite-Lived Intangible Assets [Line Items]    
Gross $ 4.2 $ 4.4
Accumulated Amortization (2.2) (1.9)
Intangible assets, Net $ 2.0 $ 2.5
Weighted-Average Useful Life (years) 5 years 5 years