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Significant Equity Method Investees (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Equity Method Investment        
Equity in earnings of affiliates $ 39.5 $ 36.0 $ 66.3 $ 53.3
PTL        
Equity Method Investment        
Ownership percentage of equity method investment 28.90%   28.90%  
Equity in earnings of affiliates     $ 63.8 51.0
Condensed income statement information        
Revenues     4,390.0 3,963.0
Gross profit     896.0 794.0
Income from continuing operations     221.0 176.0
Net income     $ 221.0 $ 176.0