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Acquisition Acquisition - Selected Unaudited Pro-forma Combined Statement of Earnings (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2015 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenues | $ 240.6 | $ 243.1 | $ 190.3 | $ 185.3 | $ 223.5 | $ 246.7 | $ 192.8 | $ 186.6 |  | $ 859.3 | $ 849.6 | $ 915.0
Business Acquisition, Pro Forma Information [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Income (Loss) from Continuing Operations, Net of Tax, Attributable to Parent | $ 17.5 | $ 20.9 | $ (6.8) | $ (12.5) | $ (6.6) | $ 4.8 | $ 13.3 | $ 5.0 |  | $ 19.1 | $ 16.5 | $ 119.6
Income (Loss) from Continuing Operations, Per Basic Share | $ 0.20 | $ 0.24 | $ (0.08) | $ (0.14) | $ (0.07) | $ 0.05 | $ 0.16 | $ 0.06 |  | $ 0.22 | $ 0.19 | $ 1.41
Income (Loss) from Continuing Operations, Per Diluted Share | $ 0.19 | $ 0.24 | $ (0.08) | $ (0.14) | $ (0.07) | $ 0.05 | $ 0.16 | $ 0.06 |  | $ 0.21 | $ 0.19 | $ 1.40
Audience, Inc. |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | $ 19.0 |  |  |
Business Acquisition, Pro Forma Information [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Pro forma |  |  |  |  |  |  |  |  |  |  | $ 879.6 | $ 1,028.3
Pro forma |  |  |  |  |  |  |  |  |  |  | $ (37.4) | $ 36.9
Pro forma |  |  |  |  |  |  |  |  |  |  | $ (0.42) | $ 0.42
Pro forma |  |  |  |  |  |  |  |  |  |  | $ (0.42) | $ 0.42

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