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CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY (USD $)
In Millions, except Share data, unless otherwise specified
Total
Total CVR Stockholders' Equity
$0.01 Par Value Common Stock
Additional Paid-In Capital
Retained Earnings (Deficit)
Treasury Stock
Accumulated Other Comprehensive Income (Loss)
Noncontrolling Interest
Initial Public Offering
Initial Public Offering
Total CVR Stockholders' Equity
Initial Public Offering
Additional Paid-In Capital
Initial Public Offering
Noncontrolling Interest
Underwritten Offering
Underwritten Offering
Total CVR Stockholders' Equity
Underwritten Offering
Additional Paid-In Capital
Underwritten Offering
Noncontrolling Interest
Private Placement
Private Placement
Total CVR Stockholders' Equity
Private Placement
Additional Paid-In Capital
Private Placement
Noncontrolling Interest
Secondary Offering
Secondary Offering
Total CVR Stockholders' Equity
Secondary Offering
Additional Paid-In Capital
Secondary Offering
Accumulated Other Comprehensive Income (Loss)
Secondary Offering
Noncontrolling Interest
Second Underwritten Offering
Second Underwritten Offering
Total CVR Stockholders' Equity
Second Underwritten Offering
Additional Paid-In Capital
Second Underwritten Offering
Noncontrolling Interest
CVR Partners, LP
CVR Partners, LP
Noncontrolling Interest
CVR Refining, LP
CVR Refining, LP
Noncontrolling Interest
Balance at Dec. 31, 2011 $ 1,299.7us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest $ 1,151.6us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_ParentMember
$ 0.9us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
$ 587.2us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
$ 566.8us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
$ (2.3)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_TreasuryStockMember
$ (1.0)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedOtherComprehensiveIncomeMember
$ 148.1us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_NoncontrollingInterestMember
                                                 
Balance (in shares) at Dec. 31, 2011     86,906,760us-gaap_CommonStockSharesOutstanding
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
                                                           
Increase (Decrease) in Stockholders' Equity                                                                  
Distributions to noncontrolling interest holders (48.8)us-gaap_MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders             (48.8)us-gaap_MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_NoncontrollingInterestMember
                                                 
Share-based compensation 7.2us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation 5.1us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_ParentMember
  5.1us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
      2.1us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_NoncontrollingInterestMember
                                                 
Modification and reclassification of equity share-based compensation award to liability based award (9.9)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardPlanModificationIncrementalCompensationCost (9.9)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardPlanModificationIncrementalCompensationCost
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_ParentMember
  (9.9)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardPlanModificationIncrementalCompensationCost
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
                                                         
Modification and reclassification of subsidiary equity share-based compensation award to liability based award (0.5)cvi_ShareBasedCompensationArrangementByShareBasedPaymentAwardPlanModificationIncrementalCompensationCostOfSubsidiary (0.3)cvi_ShareBasedCompensationArrangementByShareBasedPaymentAwardPlanModificationIncrementalCompensationCostOfSubsidiary
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_ParentMember
  (0.3)cvi_ShareBasedCompensationArrangementByShareBasedPaymentAwardPlanModificationIncrementalCompensationCostOfSubsidiary
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
      (0.2)cvi_ShareBasedCompensationArrangementByShareBasedPaymentAwardPlanModificationIncrementalCompensationCostOfSubsidiary
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_NoncontrollingInterestMember
                                                 
Exercise of stock options (in shares)     22,900us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
                                                           
Exercise of stock options 0.4us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised 0.4us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_ParentMember
  0.4us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
                                                         
Redemption of common units (0.3)us-gaap_StockRedeemedOrCalledDuringPeriodValue (0.2)us-gaap_StockRedeemedOrCalledDuringPeriodValue
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_ParentMember
  (0.2)us-gaap_StockRedeemedOrCalledDuringPeriodValue
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
      (0.1)us-gaap_StockRedeemedOrCalledDuringPeriodValue
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_NoncontrollingInterestMember
                                                 
Net income 412.6us-gaap_ProfitLoss 378.6us-gaap_ProfitLoss
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_ParentMember
    378.6us-gaap_ProfitLoss
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
    34.0us-gaap_ProfitLoss
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_NoncontrollingInterestMember
                                                 
Net gain (loss) on interest rate swaps, net of tax (0.3)us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax (0.2)us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_ParentMember
        (0.2)us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedOtherComprehensiveIncomeMember
(0.1)us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_NoncontrollingInterestMember
                                                 
Balance at Dec. 31, 2012 1,660.1us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest 1,525.1us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_ParentMember
0.9us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
582.3us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
945.4us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
(2.3)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_TreasuryStockMember
(1.2)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedOtherComprehensiveIncomeMember
135.0us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_NoncontrollingInterestMember
                                                 
Balance (in shares) at Dec. 31, 2012     86,929,660us-gaap_CommonStockSharesOutstanding
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
                                                           
Increase (Decrease) in Stockholders' Equity                                                                  
Impact from the issuance of CVR Refining / CVR Partners common units to the public                 505.7us-gaap_StockIssuedDuringPeriodValueNewIssues
/ us-gaap_TransactionTypeAxis
= us-gaap_IPOMember
229.3us-gaap_StockIssuedDuringPeriodValueNewIssues
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_ParentMember
/ us-gaap_TransactionTypeAxis
= us-gaap_IPOMember
229.3us-gaap_StockIssuedDuringPeriodValueNewIssues
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
/ us-gaap_TransactionTypeAxis
= us-gaap_IPOMember
276.4us-gaap_StockIssuedDuringPeriodValueNewIssues
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_NoncontrollingInterestMember
/ us-gaap_TransactionTypeAxis
= us-gaap_IPOMember
297.6us-gaap_StockIssuedDuringPeriodValueNewIssues
/ us-gaap_TransactionTypeAxis
= cvi_UnderwrittenOfferingMember
148.9us-gaap_StockIssuedDuringPeriodValueNewIssues
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_ParentMember
/ us-gaap_TransactionTypeAxis
= cvi_UnderwrittenOfferingMember
148.9us-gaap_StockIssuedDuringPeriodValueNewIssues
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
/ us-gaap_TransactionTypeAxis
= cvi_UnderwrittenOfferingMember
148.7us-gaap_StockIssuedDuringPeriodValueNewIssues
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_NoncontrollingInterestMember
/ us-gaap_TransactionTypeAxis
= cvi_UnderwrittenOfferingMember
46.3us-gaap_StockIssuedDuringPeriodValueNewIssues
/ us-gaap_TransactionTypeAxis
= us-gaap_PrivatePlacementMember
23.6us-gaap_StockIssuedDuringPeriodValueNewIssues
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_ParentMember
/ us-gaap_TransactionTypeAxis
= us-gaap_PrivatePlacementMember
23.6us-gaap_StockIssuedDuringPeriodValueNewIssues
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
/ us-gaap_TransactionTypeAxis
= us-gaap_PrivatePlacementMember
22.7us-gaap_StockIssuedDuringPeriodValueNewIssues
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_NoncontrollingInterestMember
/ us-gaap_TransactionTypeAxis
= us-gaap_PrivatePlacementMember
204.0us-gaap_StockIssuedDuringPeriodValueNewIssues
/ us-gaap_TransactionTypeAxis
= cvi_SecondaryOfferingMember
129.9us-gaap_StockIssuedDuringPeriodValueNewIssues
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_ParentMember
/ us-gaap_TransactionTypeAxis
= cvi_SecondaryOfferingMember
129.7us-gaap_StockIssuedDuringPeriodValueNewIssues
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
/ us-gaap_TransactionTypeAxis
= cvi_SecondaryOfferingMember
0.2us-gaap_StockIssuedDuringPeriodValueNewIssues
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedOtherComprehensiveIncomeMember
/ us-gaap_TransactionTypeAxis
= cvi_SecondaryOfferingMember
74.1us-gaap_StockIssuedDuringPeriodValueNewIssues
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_NoncontrollingInterestMember
/ us-gaap_TransactionTypeAxis
= cvi_SecondaryOfferingMember
               
Dividends paid to CVR Energy stockholders (1,237.3)us-gaap_DividendsCommonStockCash (1,237.3)us-gaap_DividendsCommonStockCash
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_ParentMember
    (1,237.3)us-gaap_DividendsCommonStockCash
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
                                                       
Distributions to noncontrolling interest holders                                                           (50.0)us-gaap_MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders
/ dei_LegalEntityAxis
= cvi_CVRPartnersLPMember
(50.0)us-gaap_MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders
/ dei_LegalEntityAxis
= cvi_CVRPartnersLPMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_NoncontrollingInterestMember
(114.2)us-gaap_MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders
/ dei_LegalEntityAxis
= cvi_CVRRefiningLimitedPartnershipMember
(114.2)us-gaap_MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders
/ dei_LegalEntityAxis
= cvi_CVRRefiningLimitedPartnershipMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_NoncontrollingInterestMember
Share-based compensation 1.2us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation (1.6)us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_ParentMember
  1.0us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
(2.6)us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
    2.8us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_NoncontrollingInterestMember
                                                 
Excess tax deficiency from share-based compensation (0.1)us-gaap_AdjustmentsToAdditionalPaidInCapitalIncomeTaxDeficiencyFromShareBasedCompensation (0.1)us-gaap_AdjustmentsToAdditionalPaidInCapitalIncomeTaxDeficiencyFromShareBasedCompensation
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_ParentMember
  (0.1)us-gaap_AdjustmentsToAdditionalPaidInCapitalIncomeTaxDeficiencyFromShareBasedCompensation
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
                                                         
Redemption of common units (0.5)us-gaap_StockRedeemedOrCalledDuringPeriodValue (0.3)us-gaap_StockRedeemedOrCalledDuringPeriodValue
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_ParentMember
  (0.3)us-gaap_StockRedeemedOrCalledDuringPeriodValue
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
      (0.2)us-gaap_StockRedeemedOrCalledDuringPeriodValue
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_NoncontrollingInterestMember
                                                 
Net income 522.0us-gaap_ProfitLoss 370.7us-gaap_ProfitLoss
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_ParentMember
    370.7us-gaap_ProfitLoss
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
    151.3us-gaap_ProfitLoss
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_NoncontrollingInterestMember
                                                 
Net gain (loss) on interest rate swaps, net of tax 0.6us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax 0.4us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_ParentMember
        0.4us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedOtherComprehensiveIncomeMember
0.2us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_NoncontrollingInterestMember
                                                 
Balance at Dec. 31, 2013 1,835.4us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest 1,188.6us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_ParentMember
0.9us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
1,114.4us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
76.2us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
(2.3)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_TreasuryStockMember
(0.6)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedOtherComprehensiveIncomeMember
646.8us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_NoncontrollingInterestMember
                                                 
Balance (in shares) at Dec. 31, 2013     86,929,660us-gaap_CommonStockSharesOutstanding
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
                                                           
Increase (Decrease) in Stockholders' Equity                                                                  
Impact from the issuance of CVR Refining / CVR Partners common units to the public                                                   148.9us-gaap_StockIssuedDuringPeriodValueNewIssues
/ us-gaap_TransactionTypeAxis
= cvi_SecondUnderwrittenOfferingMember
60.3us-gaap_StockIssuedDuringPeriodValueNewIssues
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_ParentMember
/ us-gaap_TransactionTypeAxis
= cvi_SecondUnderwrittenOfferingMember
60.3us-gaap_StockIssuedDuringPeriodValueNewIssues
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
/ us-gaap_TransactionTypeAxis
= cvi_SecondUnderwrittenOfferingMember
88.6us-gaap_StockIssuedDuringPeriodValueNewIssues
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_NoncontrollingInterestMember
/ us-gaap_TransactionTypeAxis
= cvi_SecondUnderwrittenOfferingMember
       
Dividends paid to CVR Energy stockholders (434.2)us-gaap_DividendsCommonStockCash (434.2)us-gaap_DividendsCommonStockCash
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_ParentMember
    (434.2)us-gaap_DividendsCommonStockCash
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
                                                       
Distributions to noncontrolling interest holders                                                           (48.2)us-gaap_MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders
/ dei_LegalEntityAxis
= cvi_CVRPartnersLPMember
(48.2)us-gaap_MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders
/ dei_LegalEntityAxis
= cvi_CVRPartnersLPMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_NoncontrollingInterestMember
(136.7)us-gaap_MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders
/ dei_LegalEntityAxis
= cvi_CVRRefiningLimitedPartnershipMember
(136.7)us-gaap_MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders
/ dei_LegalEntityAxis
= cvi_CVRRefiningLimitedPartnershipMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_NoncontrollingInterestMember
Share-based compensation 0.1us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation (0.7)us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_ParentMember
  0.1us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
(0.8)us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
    0.8us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_NoncontrollingInterestMember
                                                 
Excess tax deficiency from share-based compensation (0.1)us-gaap_AdjustmentsToAdditionalPaidInCapitalIncomeTaxDeficiencyFromShareBasedCompensation (0.1)us-gaap_AdjustmentsToAdditionalPaidInCapitalIncomeTaxDeficiencyFromShareBasedCompensation
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_ParentMember
  (0.1)us-gaap_AdjustmentsToAdditionalPaidInCapitalIncomeTaxDeficiencyFromShareBasedCompensation
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
                                                         
Net income 309.4us-gaap_ProfitLoss 173.9us-gaap_ProfitLoss
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_ParentMember
    173.9us-gaap_ProfitLoss
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
    135.5us-gaap_ProfitLoss
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_NoncontrollingInterestMember
                                                 
Net gain (loss) on interest rate swaps, net of tax 0.7us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax 0.3us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_ParentMember
        0.3us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedOtherComprehensiveIncomeMember
0.4us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_NoncontrollingInterestMember
                                                 
Balance at Dec. 31, 2014 $ 1,675.3us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest $ 988.1us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_ParentMember
$ 0.9us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
$ 1,174.7us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
$ (184.9)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
$ (2.3)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_TreasuryStockMember
$ (0.3)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedOtherComprehensiveIncomeMember
$ 687.2us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_NoncontrollingInterestMember
                                                 
Balance (in shares) at Dec. 31, 2014     86,929,660us-gaap_CommonStockSharesOutstanding
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember