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Statement of Cash Flows (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Noncash Investing and Financing Items [Abstract]      
Recognition of asset retirement obligation $ 0.7us-gaap_LiabilitiesAssumed1 $ 1.0us-gaap_LiabilitiesAssumed1 $ 1.9us-gaap_LiabilitiesAssumed1
Accrued and payable capital expenditures 140.6us-gaap_CapitalExpendituresIncurredButNotYetPaid 90.3us-gaap_CapitalExpendituresIncurredButNotYetPaid 25.9us-gaap_CapitalExpendituresIncurredButNotYetPaid
Accrued debt issuance costs 0.5us-gaap_DebtIssuanceCostsIncurredDuringNoncashOrPartialNoncashTransaction    
Contribution of Property     $ 178.0us-gaap_ContributionOfProperty