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Acquisitions and Strategic Investments (Narrative) (Details) - USD ($) $ in Millions | Mar. 14, 2018 | Feb. 21, 2018 | Dec. 31, 2018 | Mar. 13, 2018 | Dec. 31, 2017
--- | --- | --- | --- | --- | ---
Business Acquisition [Line Items] |  |  |  |  |
Goodwill |  |  | $ 54.6 |  | $ 0.0
Ivie and Associates |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Cash paid for acquisitions |  | $ 90.0 |  |  |
Potential earn-out |  | 16.0 |  |  |
Preliminary purchase price |  | 105.4 |  |  |
Acquired cash |  | 13.6 |  |  |
Estimated future cash payments |  | 15.4 |  |  |
Identifiable finite-lived intangibles acquired |  | 79.6 |  |  |
Goodwill |  | 28.3 |  |  |
Goodwill, tax deductible |  | $ 26.4 |  |  |
Ivie and Associates | Minimum |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Estimated finite-lived intangible assets, useful life (in years) |  | 3 years |  |  |
Ivie and Associates | Maximum |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Estimated finite-lived intangible assets, useful life (in years) |  | 8 years |  |  |
Rise Interactive |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Cash paid for acquisitions | $ 8.7 |  |  |  |
Preliminary purchase price | 48.5 |  |  |  |
Acquired cash | $ 13.7 |  |  |  |
Noncontrolling interest, ownership percentage by noncontrolling owners | 43.00% |  |  |  |
Identifiable finite-lived intangibles acquired | $ 23.1 |  |  |  |
Goodwill | $ 26.3 |  |  |  |
Parent ownership percentage | 57.00% |  |  | 19.00% |
Conversion of loans to equity ownership | $ 9.3 |  |  |  |
Rise Interactive | Minimum |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Estimated finite-lived intangible assets, useful life (in years) | 5 years |  |  |  |
Rise Interactive | Maximum |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Estimated finite-lived intangible assets, useful life (in years) | 6 years |  |  |  |

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