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Intangible Assets (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2015 | Jun. 30, 2014 | Jun. 30, 2015 | Jun. 30, 2014
Intangible Assets |  |  |  |
Amortization and impairment expenses of intangible assets | $ 28.1 | $ 28.1 | $ 55.9 | $ 55.5
Acquired Client Relationships |  |  |  |
Intangible Assets |  |  |  |
Weighted average life |  |  | 10 years |
Amortization and impairment expenses of intangible assets | 28.1 | 28.1 | $ 55.9 | 55.5
Annual amortization expense attributable to current equity method Affiliates for next five years |  |  |  |
2015 | 120.0 |  | 120.0 |
2016 | 120.0 |  | 120.0 |
2017 | 120.0 |  | 120.0 |
2018 | 120.0 |  | 120.0 |
2019 | 120.0 |  | $ 120.0 |
Acquired Client Relationships | Affiliated Entity |  |  |  |
Intangible Assets |  |  |  |
Weighted average life |  |  | 14 years |
Amortization and impairment expenses of intangible assets | 8.7 | $ 8.9 | $ 17.5 | $ 14.3
Annual amortization expense attributable to current equity method Affiliates for next five years |  |  |  |
2015 | 34.1 |  | 34.1 |
2016 | 31.9 |  | 31.9 |
2017 | 31.9 |  | 31.9 |
2018 | 31.9 |  | 31.9 |
2019 | 31.9 |  | $ 31.9 |
Equity Method Investee |  |  |  |
Intangible Assets |  |  |  |
Goodwill and intangible assets acquired | $ 24.4 |  |  |

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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 350 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274 Reference 2: 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 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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