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Employee Benefit Benefits and Stock-Based Compensation - Range of OSO Exercise Prices (Details) (Outperform Stock Options, USD $)
In Millions, except Share data, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Outperform Stock Options
       
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range        
Options exercised, Weighted Average Initial Strike Price (in dollars per share) $ 24.26us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
$ 14.10us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
$ 12.48us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
 
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number 1,217,869us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
2,148,865us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
2,066,419us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
1,288,712us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
Total realized value of OSO units $ 18.7us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
$ 1.5us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
$ 0.8us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
 
OSO units Outstanding, Range of Exercise Prices, Minimum (in dollars per share) $ 16.99lvlt_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingInitialExercisePriceMinimum
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
$ 14.1lvlt_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingInitialExercisePriceMinimum
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
$ 14.10lvlt_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingInitialExercisePriceMinimum
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
$ 10.50lvlt_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingInitialExercisePriceMinimum
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Initial Exercise Price, Maximum $ 27.53lvlt_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingInitialExercisePriceMaximum
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
$ 36.60lvlt_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingInitialExercisePriceMaximum
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
$ 36.60lvlt_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingInitialExercisePriceMaximum
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
$ 36.60lvlt_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingInitialExercisePriceMaximum
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
OSO units Outstanding, Number Outstanding (in shares) 1,217,869us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfOutstandingOptions
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
     
OSO units Outstanding, Average Remaining Contractual Term 10 months 24 days 1 year 5 months 15 days 1 year 8 months 23 days 1 year 6 months 11 days
OSO units Outstanding, Weighted Average Initial Strike Price (in dollars per share) $ 22.76us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
$ 23.99us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
$ 23.40us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
$ 20.51us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period (771,251)us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
(107,228)us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
(67,299)us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
 
OSO units Exercisable, Number Exercisable (in shares) 0us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfExercisableOptions
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
     
OSO units Exercisable, Weighted Average Initial Strike Price (in dollars per share) $ 0.00us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeExercisableOptionsWeightedAverageExercisePrice1
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
     
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures in Period (52,901)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
(271,883)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
(72,335)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
 
Share-based Compensation Arrangement by Share-based Payment Award, Shares Issued in Period 732,593us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesIssuedInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
90,879us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesIssuedInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesIssuedInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember