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Business Segments - Recast Quarterly Selected Financial Data (Details) - USD ($) $ in Millions | 3 Months Ended
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Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |  |  |  |
Revenue | $ 811.8 |  |  |  | $ 725.4 |  |  |  |
Operating income (loss) | $ 49.4 |  |  |  | 88.0 |  |  |  |
Social |  |  |  |  |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |  |  |  |
Revenue |  | $ 95.5 | $ 95.1 | $ 91.1 | 80.2 | $ 74.8 | $ 70.3 | $ 69.1 | $ 60.2
Operating income (loss) |  | 14.4 | 12.2 | 17.5 | 13.5 | 11.9 | 8.1 | 13.4 | 11.0
Digital |  |  |  |  |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |  |  |  |
Revenue |  | 17.8 | 16.3 | 15.7 | 16.1 | 16.8 | 14.9 | 14.3 | 12.4
Operating income (loss) |  | 1.1 | 0.7 | 1.3 | 3.7 | 1.8 | 1.5 | 0.3 | 0.5
Interactive |  |  |  |  |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |  |  |  |
Revenue |  | 113.3 | 111.4 | 106.8 | 96.3 | 91.6 | 85.2 | 83.4 | 72.6
Operating income (loss) |  | $ 15.5 | $ 12.9 | $ 18.8 | $ 17.2 | $ 13.7 | $ 9.6 | $ 13.7 | $ 11.5

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