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v3.20.4

Subsequent Events - Additional Information (Details) - USD ($) $ / shares in Units, $ in Millions |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 Months Ended | 12 Months Ended
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Feb. 10, 2021 | Jan. 15, 2021 | Oct. 06, 2020 | Jul. 07, 2020 | Apr. 06, 2020 | Feb. 03, 2020 | Oct. 14, 2019 | Jul. 09, 2019 | Apr. 03, 2019 | Feb. 04, 2019 | Oct. 15, 2018 | Jul. 10, 2018 | Apr. 11, 2018 | Feb. 05, 2018 | Jan. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends Payable, Date Declared |  |  | Oct. 06, 2020 | Jul. 07, 2020 | Apr. 06, 2020 | Feb. 03, 2020 | Oct. 14, 2019 | Jul. 09, 2019 | Apr. 03, 2019 | Feb. 04, 2019 | Oct. 15, 2018 | Jul. 10, 2018 | Apr. 11, 2018 | Feb. 05, 2018 |  |  |  |
Dividends declared per share |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1.78 | $ 1.92 | $ 1.88
Dividends payable, date to be paid |  |  | Oct. 23, 2020 | Jul. 24, 2020 | Apr. 24, 2020 | Feb. 21, 2020 | Nov. 01, 2019 | Jul. 26, 2019 | Apr. 22, 2019 | Feb. 22, 2019 | Nov. 02, 2018 | Jul. 27, 2018 | May 03, 2018 | Feb. 27, 2018 |  |  |  |
Dividends payable, date of record |  |  | Oct. 16, 2020 | Jul. 17, 2020 | Apr. 17, 2020 | Feb. 14, 2020 | Oct. 25, 2019 | Jul. 19, 2019 | Apr. 15, 2019 | Feb. 15, 2019 | Oct. 26, 2018 | Jul. 20, 2018 | Apr. 23, 2018 | Feb. 16, 2018 |  |  |  |
Options granted (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 480 |  |
Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends Payable, Date Declared |  | Jan. 15, 2021 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends declared per share |  | $ 0.25 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends payable, date to be paid |  | Feb. 01, 2021 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends payable, date of record |  | Jan. 25, 2021 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Options granted (in shares) | 482,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event | Talbot Hall Reentry Center |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net proceeds from sale of business |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 13 |  |  |
Subsequent Event | Restricted Stock Award |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restricted stock granted (in shares) | 1,171,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event | Performance Shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restricted stock granted (in shares) | 644,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Performance period | 3 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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