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Acquisition Acquisition (Details) - USD ($) $ / shares in Units, $ in Millions |  | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Jul. 01, 2015 | 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] |  |  |  |  |  |  |  |  |  |  |  |  |
Document Fiscal Year Focus |  |  |  |  |  |  |  |  |  |  | 2016 |  |
Revenues |  | $ 240.6 | $ 243.1 | $ 190.3 | $ 185.3 | $ 223.5 | $ 246.7 | $ 192.8 | $ 186.6 |  | $ 859.3 | $ 849.6 | $ 915.0
Net (loss) earnings |  | $ 19.3 | $ (7.6) | $ (24.6) | $ (29.4) | $ (187.0) | $ (14.9) | $ (16.1) | $ (15.8) |  | $ (42.3) | $ (233.8) | $ (87.0)
Audience, Inc. |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Cash equivalent price (usd per share) | $ 2.51 |  |  |  |  |  |  |  |  |  |  |  |
Consideration transfer, number of shares for each share of acquired entity's shares (in shares) | 0.13207 |  |  |  |  |  |  |  |  |  |  |  |
Number of shares issued (in shares) | 3,200,000 |  |  |  |  |  |  |  |  |  |  |  |
Fair value of total consideration | $ 123.3 |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Consideration Transferred, Equity Interests Issued and Issuable, Number of Shares for Unvested Equity Awards Assumed | 461,371.00 |  |  |  |  |  |  |  |  |  |  |  |
Consideration transferred, enterprise value, net of cash and short-term investments | $ 92.8 |  |  |  |  |  |  |  |  |  |  |  |
Cash and short-term investments | $ 30.5 |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  | $ 19.0 |  |  |
Net (loss) earnings |  |  |  |  |  |  |  |  |  | $ 31.6 |  |  |
Fair Value Inputs, Discount Rate | 27.00% |  |  |  |  |  |  |  |  |  |  |  |

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