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Other Long-term Liabilities - Schedule of Other Long-term Liabilities (Details) - USD ($)
$ in Millions
Jun. 30, 2019
Dec. 31, 2018
Other Liabilities Noncurrent [Abstract]    
Asset retirement obligations $ 61.2 $ 55.5
Deferred revenue 173.9 175.5
Operating lease liabilities 51.3  
Other liabilities 18.6 31.2
Total long-term liabilities $ 305.0 $ 262.2