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Acquisitions - Presque Isle (Details) - USD ($)
$ in Millions
4 Months Ended 12 Months Ended
Jan. 11, 2019
Dec. 31, 2018
Dec. 31, 2019
Aug. 31, 2018
Dec. 31, 2017
Business Acquisition [Line Items]          
Cash acquired in the acquisition       $ 13.1  
Goodwill acquired in the acquisition   $ 338.0 $ 367.1   $ 317.6
Revenue since date of acquisition   $ 25.9      
Presque Isle          
Business Acquisition [Line Items]          
Payments to acquire business $ 178.9        
Working capital and other purchase price adjustments 1.6        
Cash acquired in the acquisition 8.4        
Goodwill acquired in the acquisition $ 26.1        
Revenue since date of acquisition     $ 138.5