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Goodwill and Other Intangible Assets - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Finite-Lived Intangible Assets [Line Items]        
Amortization expense $ 6.5 $ 5.1 $ 18.1 $ 15.3
Facility management contracts        
Finite-Lived Intangible Assets [Line Items]        
Weighted average period     1 year 7 months 6 days