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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 | 12 Months Ended
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Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Vesting rate of restricted common unit awards (in hundredths) | 25.00% |  |  |  |  |
Summary of awards activity, equity instruments other than options [Roll Forward] |  |  |  |  |  |
Beginning of period (in units) | 3,893,486 |  | 3,868,216 |  | 3,561,614 |
Granted (in units) | 1,774,526 | [1] | 1,588,738 | [2] | 1,414,630 | [3]
Vested (in units) | (1,885,348) |  | (1,316,603) |  | (924,108) |
Forfeited (in units) | (172,057) |  | (246,865) |  | (183,920) |
End of period (in units) | 3,610,607 |  | 3,893,486 |  | 3,868,216 |
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) | $ 40.87 | [4] | $ 34.22 | [4] | $ 29.78 | [4]
Granted weighted-average grant date fair value per unit (in dollars per unit) | $ 57.22 | [1],[4] | $ 51.96 | [2],[4] | $ 43.66 | [3],[4]
Vested weighted-average grant date fair value per unit (in dollars per unit) | $ 34.97 | [4] | $ 34.80 | [4] | $ 31.54 | [4]
Forfeited weighted-average grant date fair value per unit (in dollars per unit) | $ 47.63 | [4] | $ 40.43 | [4] | $ 34.27 | [4]
Weighted-average grant date fair value per unit, at end of period (in dollars per unit) | $ 51.66 | [4] | $ 40.87 | [4] | $ 34.22 | [4]
Summary of awards activity, equity instruments other than options, additional disclosures [Abstract] |  |  |  |  |  |
Aggregate grant date fair value | $ 101.5 |  | $ 82.5 |  | $ 61.8 |
Estimated forfeiture rate (in hundredths) | 3.90% |  | 3.25% |  | 4.60% |
Cash distributions paid to restricted common unitholders | 10.6 |  | 10.5 |  | 9.6 |
Total intrinsic value of our restricted common unit awards that vested during period | 109.9 |  | 67.0 |  | 39.1 |
Unrecognized Compensation Expense [Abstract] |  |  |  |  |  |
Unrecognized compensation cost | 72.8 |  |  |  |  |
Recognition period for total unrecognized compensation cost | 1 year 10 months 24 days |  |  |  |  |
Minimum [Member] |  |  |  |  |  |
Summary of awards activity, equity instruments other than options, additional disclosures [Abstract] |  |  |  |  |  |
Grant date market price of common units (in dollars per unit) | $ 57.11 |  | $ 51.92 |  | $ 40.54 |
Maximum [Member] |  |  |  |  |  |
Summary of awards activity, equity instruments other than options, additional disclosures [Abstract] |  |  |  |  |  |
Grant date market price of common units (in dollars per unit) | $ 63.48 |  | $ 53.54 |  | $ 44.67 |
Enterprise [Member] |  |  |  |  |  |
Unrecognized Compensation Expense [Abstract] |  |  |  |  |  |
Unrecognized compensation cost | $ 66.2 |  |  |  |  |
[1] | The aggregate grant date fair value of restricted common unit awards issued during 2013 was $101.5 million based on a grant date market price of our common units ranging from $57.11 to $63.48 per unit. An estimated annual forfeiture rate of 3.9% was applied to these awards.
[2] | The aggregate grant date fair value of restricted common unit awards issued during 2012 was $82.5 million based on a grant date market price of our common units ranging from $51.92 to $53.54 per unit. An estimated annual forfeiture rate of 3.25% was applied to these awards.
[3] | The aggregate grant date fair value of restricted common unit awards issued during 2011 was $61.8 million based on a grant date market price of our common units ranging from $40.54 to $44.67 per unit. An estimated annual forfeiture rate of 4.6% was applied to these awards.
[4] | 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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- Definition Unrecognized cost of unvested share-based compensation awards. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(3) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(3) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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