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Acquisitions and Divestitures - 2017 Purchase Price Allocation (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Business Acquisition [Line Items]      
Cash paid for acquisition of businesses $ 21.3 $ 120.7 $ 430.8
Acquisitions 2017      
Business Acquisition [Line Items]      
Cash paid for acquisition of businesses   108.2  
Cash and cash equivalents   4.5  
Amounts due to sellers   0.7  
Non-monetary consideration   4.2  
Purchase price   117.6  
Assets acquired:      
Cash and cash equivalents   4.5  
Property and equipment   10.6  
Goodwill and identifiable intangible assets   105.2  
Other current and long-term assets   10.2  
Liabilities assumed:      
Accrued expenses and other current liabilities   (3.7)  
Long-term liabilities and deferred tax liabilities   (9.1)  
Purchase price   $ 117.6