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Acquisitions - Presque Isle (Details) - USD ($)
$ in Millions
3 Months Ended
Jan. 11, 2019
Mar. 31, 2019
Dec. 31, 2018
Business Acquisition [Line Items]      
Goodwill   $ 363.8 $ 338.0
Presque Isle      
Business Acquisition [Line Items]      
Payments to acquire business $ 178.9    
Working capital and other purchase price adjustments 0.8    
Cash acquired in the acquisition 8.4    
Goodwill $ 25.8    
Revenue since date of acquisition   $ 29.7