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Intangible Assets (Details) (USD $) In Millions, unless otherwise specified | 0 Months Ended | 3 Months Ended | 6 Months Ended
--- | --- | --- | ---
Apr. 01, 2014 | Jun. 30, 2014 | Jun. 30, 2013 | Jun. 30, 2014 | Jun. 30, 2013
Intangible Assets |  |  |  |  |
Amortization and impairment expenses of intangible assets |  | $ 28.1 | $ 32.6 | $ 55.5 | $ 65.5
Tax deduction period for goodwill and client relationships amortization expense | 15 years |  |  |  |
Annual amortization expense attributable to current equity method Affiliates for next five years |  |  |  |  |
2014 |  | 110.0 |  | 110.0 |
2015 |  | 110.0 |  | 110.0 |
2016 |  | 110.0 |  | 110.0 |
EIG Global Energy Partners, LLC |  |  |  |  |
Intangible Assets |  |  |  |  |
Acquired client relationships | 115.0 |  |  |  |
Acquired Client Relationships |  |  |  |  |
Intangible Assets |  |  |  |  |
Weighted average life |  |  |  | 10 years |
Amortization and impairment expenses of intangible assets |  | 28.1 | 32.6 | 55.5 | 65.5
Annual amortization expense attributable to current equity method Affiliates for next five years |  |  |  |  |
2017 |  | 110.0 |  | 110.0 |
2018 |  | 110.0 |  | 110.0 |
Acquired Client Relationships | EIG Global Energy Partners, LLC |  |  |  |  |
Intangible Assets |  |  |  |  |
Weighted average life |  |  |  | 12 years |
Amortization and impairment expenses of intangible assets |  | 7.3 | 10.3 | 12.7 | 20.7
Annual amortization expense attributable to current equity method Affiliates for next five years |  |  |  |  |
2014 |  | 26.4 |  | 26.4 |
2015 |  | 20.2 |  | 20.2 |
2016 |  | 17.6 |  | 17.6 |
2017 |  | 17.7 |  | 17.7 |
2018 |  | $ 17.7 |  | $ 17.7 |

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- Definition The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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- Definition The amount of identifiable intangible assets recognized as of the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6910749&loc=d3e4845-128472 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 55 -Paragraph 37 -URI http://asc.fasb.org/extlink&oid=25498275&loc=d3e2207-128464 + Details
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- Definition Amount of amortization expense expected to be recognized in the remainder of the fiscal year following the latest fiscal year ended for assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References No definition available. + Details
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- Definition Amount of amortization expense expected to be recognized during the fourth fiscal year following the latest fiscal year for assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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- Definition Amount of amortization expense expected to be recognized during the third fiscal year following the latest fiscal year for assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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- Definition Amount of amortization expense expected to be recognized during the second fiscal year following the latest fiscal year for assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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