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Fair Value Of Assets And Liabilities - Level 3 Investment Rollforward (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Fair Value of Level 3 Investments Rollforward |  |  |
Big Fish Games deferred payments, payments | $ 26.4 | $ 28.5 | $ 0.0
Change in fair value | 5.7 | 21.7 |
Fair Value, Inputs, Level 3 |  |  |
Fair Value of Level 3 Investments Rollforward |  |  |
Big Fish Games deferred payments, beginning balance | 54.8 |  |
Big Fish Games earnout liability, beginning balance | 345.2 |  |
Bluff contingent consideration, beginning balance | 2.3 |  |
Total, beginning balance | 402.3 |  |
Big Fish Games deferred payments, payments | (28.4) |  |
Big Fish Games earnout liability, payments | (281.6) |  |
Payments | (310.0) |  |
Big Fish Games deferred payments, change in fair value | 1.4 |  |
Big Fish Games earnout liability, change in fair value | 4.3 |  |
Bluff contingent consideration, change in fair value | (2.3) |  |
Change in fair value | 3.4 |  |
Big Fish Games deferred payments, ending balance | 27.8 | 54.8 |
Big Fish Games earnout liability, ending balance | 67.9 | 345.2 |
Bluff contingent consideration, ending balance | 0.0 | 2.3 |
Total, ending balance | $ 95.7 | $ 402.3 |

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