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Restructuring Charges (Details) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2019 USD ($) | Sep. 30, 2019 USD ($) | Jun. 30, 2019 USD ($) | Mar. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Sep. 30, 2018 USD ($) | Jun. 30, 2018 USD ($) | Mar. 31, 2018 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($)
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Severance and termination costs |  |  |  |  |  |  |  |  | $ 22.0 | $ 0.0 | $ 0.0
Lease restructuring costs |  |  |  |  |  |  |  |  | 11.9 | 0.0 | (0.4)
Total Restructuring Charges | $ 0.0 | $ 0.0 | $ 2.1 | $ 31.8 | $ 0.0 | $ 0.0 | $ 0.0 | $ 0.0 | $ 33.9 | 0.0 | $ (0.4)
Restructuring and Related Cost, Number of Positions Eliminated |  |  |  |  |  |  |  |  | 627 |  |
Payments for Restructuring |  |  |  |  |  |  |  |  | $ 20.4 |  |
Restructuring Reserve | $ 1.6 |  |  |  | $ 0.0 |  |  |  | 1.6 | $ 0.0 |
CMG [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total Restructuring Charges |  |  |  |  |  |  |  |  | 5.6 |  |
IAN [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total Restructuring Charges |  |  |  |  |  |  |  |  | $ 27.6 |  |

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