Supplemental Cash Flow Information (Details) - USD ($)
$ in Millions
 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Supplemental Cash Flow [Line Items]    
Capital expenditures included in current liabilities [1] $ 184.5  
Cash paid for interest, net of interest capitalized amounts 21.3  
Cash paid for income taxes $ 0.0  
Predecessor [Member]    
Supplemental Cash Flow [Line Items]    
Capital expenditures included in current liabilities [1]   $ 94.0
Cash paid for interest, net of interest capitalized amounts   27.7
Cash paid for income taxes   $ 35.7
[1] Capital expenditures included in current liabilities is comprised of "Accrued capital expenditures" and certain other amounts included within "Accounts payable" on the Condensed Consolidated and Combined Balance Sheet (unaudited).