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Other Intangible Assets (Schedule of Other Intangible Assets) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Details of other intangible assets    
Gross Value $ 134.8 $ 124.9
Accumulated Amortization 35.3 28.3
Net Value 99.5 96.6
Indefinite-lived tradenames    
Details of other intangible assets    
Indefinite-lived intangible assets $ 23.7 22.4
Customer relationships    
Details of other intangible assets    
Weighted Average Useful Life (Years) 9 years 2 months  
Finite-lived intangible assets, Gross Value $ 83.4 75.5
Accumulated Amortization 29.3 23.7
Net, Finite-lived intangible assets $ 54.1 51.8
Technology    
Details of other intangible assets    
Weighted Average Useful Life (Years) 17 years 6 months  
Finite-lived intangible assets, Gross Value $ 23.6 23.0
Accumulated Amortization 3.0 1.8
Net, Finite-lived intangible assets $ 20.6 21.2
Other    
Details of other intangible assets    
Weighted Average Useful Life (Years) 7 years 2 months  
Finite-lived intangible assets, Gross Value $ 4.1 4.0
Accumulated Amortization 3.0 2.8
Net, Finite-lived intangible assets $ 1.1 $ 1.2