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Equity-based Awards, Restricted Unit Awards (Details) (Restricted Common Unit Awards [Member], USD $) In Millions, except Share data, unless otherwise specified	3 Months Ended			9 Months Ended
	Sep. 30, 2014		Sep. 30, 2013	Sep. 30, 2014		Sep. 30, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting rate of restricted common unit awards (in hundredths)	25.00%			25.00%
Summary of awards activity, equity instruments other than options [Roll Forward]
Beginning of period (in units)				7,221,214
Vested (in units)				(2,586,398)
Forfeited (in units)				(267,200)
End of period (in units)	4,367,616			4,367,616
Restricted units outstanding, weighted-average grant date fair value [Roll Forward]
Weighted-average grant date fair value per unit, at beginning of period (in dollars per unit)				$ 25.83	[1]
Vested weighted-average grant date fair value per unit (in dollars per unit)				$ 23.92	[1]
Forfeited weighted-average grant date fair value per unit (in dollars per unit)				$ 26.36	[1]
Weighted-average grant date fair value per unit, at end of period (in dollars per unit)	$ 26.93	[1]		$ 26.93	[1]
Summary of awards activity, equity instruments other than options, additional disclosures [Abstract]
Cash distributions paid to restricted common unitholders	$ 1.6		$ 2.6	$ 5.7		$ 8.2
Total intrinsic value of our restricted common unit awards that vested during period	1.3		1.0	85.4		107.4
Unrecognized Compensation Expense [Abstract]
Unrecognized compensation cost	37.8			37.8
Recognition period for total unrecognized compensation cost				1 year 7 months 6 days
Enterprise [Member]
Unrecognized Compensation Expense [Abstract]
Unrecognized compensation cost	$ 33.6			$ 33.6
[1] Determined by dividing the aggregate grant date fair value of awards (before an allowance for forfeitures) by the number of awards issued.

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Amount of cash distribution paid to restricted common unit-holder.

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Refers to percentage of vesting rate of equity-based awards per year beginning one year after the grant date.

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Unrecognized cost of unvested share-based compensation awards.

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Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

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Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event.

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The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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The weighted average fair value of nonvested awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units.

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Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash.

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The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.

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