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Equity Method Investments in Affiliates - Aggregate Purchase Price Allocation (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016 | Dec. 31, 2016 | Jan. 04, 2016
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Deferred Tax Liability | $ (677.0) |  | $ (677.0) |  | $ (660.8) |
Goodwill | 2,647.5 |  | 2,647.5 |  | 2,628.1 |
Intangible amortization and impairments | 22.0 | $ 28.6 | 43.9 | $ 55.3 |  |
Acquired Client Relationships |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Definite-lived acquired client relationships | 461.2 |  | 461.2 |  | 501.9 |
Indefinite-lived acquired client relationships | 1,014.9 |  | 1,014.9 |  | $ 995.5 |
Equity Method Investee | Acquired Client Relationships |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Intangible amortization and impairments | 24.0 | 14.8 | 45.8 | 29.0 |  |
Equity Method Investee | Systematica Investment LP and Baring Private Equity Asia |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Consideration paid |  |  |  |  |  | $ 551.0
Deferred Tax Liability |  |  |  |  |  | (32.0)
Goodwill |  |  |  |  |  | 352.6
Equity Method Investments |  |  |  |  |  | 551.0
Equity Method Investee | Systematica Investment LP and Baring Private Equity Asia | Acquired Client Relationships |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Definite-lived acquired client relationships |  |  |  |  |  | 223.1
Indefinite-lived acquired client relationships |  |  |  |  |  | $ 7.3
Intangible amortization and impairments | $ 3.7 | $ 4.5 | $ 7.4 | $ 7.4 |  |

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