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Long-Term Incentive Plan (Vested Unit Awards) (Details) (Management [Member], USD $)
In Millions, except Share data, unless otherwise specified |
12 Months Ended | |||||||
|---|---|---|---|---|---|---|---|---|
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Dec. 31, 2013
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Dec. 31, 2012
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Dec. 31, 2011
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Management [Member]
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| Long Term Incentive Plan [Line Items] | ||||||||
| Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Nonvested Total Unit Award Accrual Number | 572,353 | 751,237 | 1,100,276 | |||||
| Fair Value of Unit Awards on Vesting Date (in millions) | $ 20.5 | [1] | $ 17.1 | [1] | $ 16.5 | [1] | ||
| Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value, Vested | $ 36.2 | $ 32.5 | $ 37.9 | |||||
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