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Acquisitions, Goodwill and Other Intangible Assets (Schedule of Intangible Assets) (Details) - USD ($)
$ in Millions
6 Months Ended 12 Months Ended
Jun. 30, 2017
Dec. 31, 2016
Finite-Lived Intangible Assets [Line Items]    
Gross $ 316.3 $ 321.3
Accumulated Amortization (210.5) (200.4)
Intangible assets, Net $ 105.8 $ 120.9
Weighted-Average Useful Life (years) 10 years 10 years
Intellectual Property [Member]    
Finite-Lived Intangible Assets [Line Items]    
Gross $ 31.3 $ 30.9
Accumulated Amortization (28.3) (27.4)
Intangible assets, Net $ 3.0 $ 3.5
Weighted-Average Useful Life (years) 9 years 9 years
Customer Related Assets [Member]    
Finite-Lived Intangible Assets [Line Items]    
Gross $ 154.9 $ 152.0
Accumulated Amortization (103.3) (97.7)
Intangible assets, Net $ 51.6 $ 54.3
Weighted-Average Useful Life (years) 12 years 12 years
Supplier Relationships [Member]    
Finite-Lived Intangible Assets [Line Items]    
Gross $ 0.3 $ 0.2
Accumulated Amortization (0.2) (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 $ 127.4 $ 133.2
Accumulated Amortization (76.8) (72.1)
Intangible assets, Net $ 50.6 $ 61.1
Weighted-Average Useful Life (years) 7 years 7 years
Non-competition Agreement [Member]    
Finite-Lived Intangible Assets [Line Items]    
Gross $ 2.4 $ 5.0
Accumulated Amortization (1.9) (3.1)
Intangible assets, Net $ 0.5 $ 1.9
Weighted-Average Useful Life (years) 5 years 5 years