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Long-Term and Other Debt - (Loss) Gain on Debt Financing Transactions (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Debt Disclosure [Abstract]    
Repayment and cancellation of principal balance at premium $ 110.3 $ 0.0
Unamortized debt discount and deferred financing costs (29.8) 25.8
Third party debt issuance fees 12.7 3.9
Loss on debt financing transactions $ 93.2 $ 29.7