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Goodwill and Other Intangible Assets - Narrative (Details) - USD ($)
$ in Millions
9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Finite-Lived Intangible Assets [Line Items]    
Amortization expense $ 17.3 $ 18.1
Facility management contracts    
Finite-Lived Intangible Assets [Line Items]    
Weighted average period 1 year 5 months 24 days