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v3.20.4

Share-Based and Other Compensation - Share-Based Compensation Cost Recorded During the Period and Other Compensation (Details) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Dec. 27, 2018 USD ($) age
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Allocated share-based compensation expense | $ 37.6 | $ 32.8 | $ 35.9 |
Share-based compensation costs | 7.4 | 5.8 | 8.0 |
Unrecognized compensation costs | $ 35.1 |  |  |
Cost not yet recognized, period for recognition | 1 year 4 months 24 days |  |  |
General and Administrative Expense [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Severance costs | $ 14.1 |  |  |
Severance [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Allocated share-based compensation expense | 4.5 |  |  |
Chief Executive Officer [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Cash retirement benefit, scenario one |  |  |  | $ 13.2
Cash retirement benefit, scenario two |  |  |  | $ 16.2
Retirement age | age |  |  |  | 73
Compensation expense | $ 1.5 | $ 1.5 | $ 12.1 |

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