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Long-term Debt and Lease Obligations: Other Lease Obligations (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended
Sep. 30, 2014
Mar. 31, 2015
Dec. 31, 2014
Other Lease Obligations [Line Items]      
Defined Benefit Plan, Contributions by Employer, Non Cash, Value $ 80.9win_DefinedBenefitPlanContributionsbyEmployerNonCashValue    
Other Lease Obligation, Lease Terms 10 years    
Total Other Lease Obligation   81.1win_TotalOtherLeaseObligation 81.0win_TotalOtherLeaseObligation
2016   6.4win_OtherLeaseObligationsMaturitiesRepaymentsofPrincipalinNextRollingTwelveMonths  
2017   6.6win_OtherLeaseObligationMaturitiesRepaymentsofPrincipalinRollingYearTwo  
2018   6.8win_OtherLeaseObligationMaturitiesRepaymentsofPrincipalinRollingYearThree  
2019   6.9win_OtherLeaseObligationMaturitiesRepaymentsofPrincipalinRollingYearFour  
2020   7.1win_OtherLeaseObligationMaturitiesRepaymentsofPrincipalinRollingYearFive  
Thereafter   90.2win_OtherLeaseObligationMaturitiesRepaymentsofPrincipalinRollingafterYearFive  
Total   124.0win_Totalmaturitiesofotherleaseobligations  
Pension Plan [Member]      
Other Lease Obligations [Line Items]      
Other Lease Obligation, Lease Terms 20 years    
Other Lease Obligation, Annual Rental Payments $ 6.3win_OtherLeaseObligationAnnualRentalPayments
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_PensionPlansDefinedBenefitMember		    
Number of Renewal Options 3win_NumberofRenewalOptions
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_PensionPlansDefinedBenefitMember		    
Lease Term of Renewal Options 5 years    
Minimum | Pension Plan [Member]      
Other Lease Obligations [Line Items]      
Annual Rent Escalations 2.00%win_AnnualRentEscalations
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_PensionPlansDefinedBenefitMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember		    
Maximum | Pension Plan [Member]      
Other Lease Obligations [Line Items]      
Annual Rent Escalations 3.00%win_AnnualRentEscalations
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_PensionPlansDefinedBenefitMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember