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Goodwill and Other Intangible Assets, Intangible Assets (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Intangible Assets    
Weighted average useful lives of acquired amortizable intangible assets 10 years  
Gross Carrying Amount (definite-lived) $ 539.6 $ 521.8
Intangible assets, gross (excluding goodwill) 725.7 707.9
Accumulated Amortization 284.1 233.5
Net Carrying Amount, (definite-lived) 255.5 288.3
Indefinite-lived trade name intangible asset 186.1 186.1
Net Carrying Amount, intangible assets $ 441.6 474.4
Customer relationships    
Intangible Assets    
Weighted average useful lives of acquired amortizable intangible assets 10 years  
Gross Carrying Amount (definite-lived) $ 398.1 381.1
Accumulated Amortization 199.8 159.1
Net Carrying Amount, (definite-lived) $ 198.3 222.0
Proprietary technology    
Intangible Assets    
Weighted average useful lives of acquired amortizable intangible assets 11 years  
Gross Carrying Amount (definite-lived) $ 107.5 106.7
Accumulated Amortization 50.7 40.9
Net Carrying Amount, (definite-lived) $ 56.8 65.8
Backlog and other    
Intangible Assets    
Weighted average useful lives of acquired amortizable intangible assets 2 years  
Gross Carrying Amount (definite-lived) $ 34.0 34.0
Accumulated Amortization 33.6 33.5
Net Carrying Amount, (definite-lived) $ 0.4 $ 0.5