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Properties - Components of Properties (Details) - USD ($)
$ in Millions
Dec. 31, 2016
Dec. 31, 2015
Property, Plant and Equipment [Line Items]    
Total properties $ 886.6 $ 876.6
Land    
Property, Plant and Equipment [Line Items]    
Total properties 2.7 2.8
Buildings    
Property, Plant and Equipment [Line Items]    
Total properties 88.2 93.1
Machinery and office equipment    
Property, Plant and Equipment [Line Items]    
Total properties 591.7 586.8
Internal-use software    
Property, Plant and Equipment [Line Items]    
Total properties 145.9 144.5
Rental equipment    
Property, Plant and Equipment [Line Items]    
Total properties $ 58.1 $ 49.4