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Other Long-term Liabilities - Schedule of Other Long-term Liabilities (Details) - USD ($)
$ in Millions
Jun. 30, 2017
Dec. 31, 2016
Other Liabilities Noncurrent [Line Items]    
Asset retirement obligations $ 49.1 $ 64.6
Mandatorily redeemable preferred interests 77.2 68.5
Deferred revenue 68.3 69.8
Other liabilities 17.0 12.2
Total long-term liabilities 588.4 $ 215.1
Permian Acquisition [Member]    
Other Liabilities Noncurrent [Line Items]    
Permian Acquisition contingent consideration, noncurrent portion $ 376.8