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Business Combinations - Narrative (Details) $ in Thousands, £ in Millions |  | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Jul. 01, 2018 USD ($) | Jul. 01, 2018 GBP (£) | Dec. 31, 2018 USD ($) | Sep. 30, 2018 USD ($) | Jun. 30, 2018 USD ($) | Sep. 30, 2018 USD ($) | Sep. 30, 2017 USD ($) | Dec. 31, 2017 USD ($)
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Drawdown from existing revolving credit facility |  |  |  |  |  | $ 79,150 | $ 0 |
Redeemable noncontrollling interest in subsidiaries |  |  |  | $ 192,744 |  | 192,744 |  | $ 30,163
Hermes |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Redeemable noncontrollling interest in subsidiaries |  |  |  | 172,400 |  | 172,400 |  |
Hermes | Restricted Stock | Put Option |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Period after vesting | 9 months | 9 months |  |  |  |  |  |
Hermes | Restricted Stock | Minimum |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Vesting period | 3 years | 3 years |  |  |  |  |  |
Hermes | Restricted Stock | Maximum |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Vesting period | 5 years | 5 years |  |  |  |  |  |
Hermes |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Remaining interest contributed to employee benefit trust | 10.50% | 10.50% |  |  |  |  |  |
Hermes | BTPS |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Ownership interest retained | 29.50% | 29.50% |  |  |  |  |  |
Hermes |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Payments to acquire business | $ 344,300 | £ 260.7 |  |  |  |  |  |
Drawdown from existing revolving credit facility | $ 18,000 |  |  |  |  |  |  |
Fair value of Redeemable noncontrolling interest | 33.00% | 33.00% |  |  |  |  |  |
Transaction costs |  |  |  | 14,500 |  | 14,500 |  |
Transaction costs expensed |  |  |  |  |  | $ 12,700 |  |
Foreign exchange gain |  |  |  |  | $ 1,700 |  |  |
Revenue |  |  |  | 49,700 |  |  |  |
Net income |  |  |  | $ 5,700 |  |  |  |
Hermes | Scenario, Forecast |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Transaction costs expensed |  |  | $ 1,000 |  |  |  |  |

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