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Properties - Components of Properties (Details) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Property, Plant and Equipment [Line Items]    
Total properties $ 898.8 $ 886.6
Land    
Property, Plant and Equipment [Line Items]    
Total properties 2.8 2.7
Buildings    
Property, Plant and Equipment [Line Items]    
Total properties 91.3 88.2
Machinery and office equipment    
Property, Plant and Equipment [Line Items]    
Total properties 601.7 591.7
Internal-use software    
Property, Plant and Equipment [Line Items]    
Total properties 157.4 145.9
Rental equipment    
Property, Plant and Equipment [Line Items]    
Total properties $ 45.6 $ 58.1