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Related Party Transactions - Schedule of Costs Incurred and Allocated (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Related Party Transaction [Line Items]      
Direct operating $ 721.6 $ 655.2 $ 713.4
Selling, general and administrative 320.6 275.2 267.6
Total expenses $ 1,818.9 1,559.7 1,521.3
THC      
Related Party Transaction [Line Items]      
Direct operating   0.6 (0.9)
Selling, general and administrative   18.0 36.0
Total expenses   $ 18.6 $ 35.1