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Business Combinations - Skaff Narratives (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Jan. 02, 2018
Mar. 31, 2019
Sep. 30, 2019
Sep. 30, 2018
Business Acquisition        
Payment for acquisition of businesses, net of cash acquired     $ 603.9 $ 12.5
Goodwill purchase price adjustment     44.0  
Skaff        
Business Acquisition        
Voting percentage acquired 100.00%      
Payment for acquisition of businesses, net of cash acquired $ 12.5      
Long-term deferred tax liabilities   $ 0.8    
Goodwill purchase price adjustment   $ 0.8 $ 0.8