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Acquisitions and Discontinued Operations - Acquisitions (Details) - USD ($) $ in Millions |  | 7 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 07, 2018 | Dec. 31, 2018 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Business Acquisition [Line Items] |  |  |  |  |
Business acquisition and other investments, net of cash acquired |  |  | $ 104.4 | $ 147.1 | $ 180.8
Net income |  |  | $ 97.2 | $ 65.3 | 81.2
Cues, Inc. |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Business acquisition and other investments, net of cash acquired | $ 164.4 |  |  |  |
Cash acquired | $ 20.6 |  |  |  |
Revenue of acquiree since acquisition |  | $ 52.3 |  |  |
Loss of acquiree since acquisition date |  | 0.4 |  |  |
Cues, Inc. | Fair Value Adjustment to Inventory |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Net income |  | $ (4.3) |  |  |
Selling, General and Administrative Expenses | Cues, Inc. | Acquisition-related Costs |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Net income |  |  |  |  | $ (2.4)

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