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Property, Plant and Equipment, net (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Property, Plant and Equipment          
Cost $ 596.0   $ 596.0   $ 552.0
Less accumulated depreciation (390.9)   (390.9)   (369.0)
Total 205.1   205.1   183.0
Depreciation 11.5 $ 11.6 23.4 $ 23.3  
Impairment of Long-Lived Assets Held-for-use   $ 5.1 0.0 $ 5.1  
Land          
Property, Plant and Equipment          
Cost 7.4   7.4   7.7
Buildings and improvements          
Property, Plant and Equipment          
Cost 103.1   103.1   103.2
Machinery, equipment, and other          
Property, Plant and Equipment          
Cost $ 485.5   $ 485.5   $ 441.1