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Retirement Benefit Plan - Additional Information (Details) - USD ($) $ / shares in Units, $ in Millions |  |  | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | --- | ---
Apr. 15, 2019 | Apr. 03, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | Dec. 31, 2019
Employee Stock Ownership Plan (ESOP) Disclosures [Line Items] |  |  |  |  |  |  |
Shares fully vested, Description |  |  |  |  | Shares allocated to a participant’s account are fully vested after three years of credited service, or in the event(s) of reaching age 65, death or disability while an active employee of the Company. |  |
Shares fully vested after credited service |  |  |  |  | 3 years |  |
Common stock shares outstanding including ESOP |  |  | 100,727,574 |  | 100,727,574 |  | 100,669,694
Company's stock held by ESOP |  |  | 76,090,531 |  | 76,090,531 |  | 78,896,806
ESOP dividends declared date |  | Apr. 03, 2019 |  |  |  |  |
ESOP dividends declared per share |  | $ 2.00 |  |  |  |  |
ESOP dividends declared amount |  | $ 52.1 |  |  |  |  |
ESOP dividends payment date |  | May 10, 2019 |  |  |  |  |
Common stock dividend ratio | 200.00% |  |  |  |  |  |
Dividends declared date | Apr. 15, 2019 |  |  |  |  |  |
Dividends record date | May 07, 2019 |  |  |  |  |  |
Dividends payment, date | May 08, 2019 |  |  |  |  |  |
Direct Costs of Contracts and Indirect, General and Administrative Expense |  |  |  |  |  |  |
Employee Stock Ownership Plan (ESOP) Disclosures [Line Items] |  |  |  |  |  |  |
ESOP contribution expense |  |  | $ 12.5 | $ 12.3 | $ 42.0 | $ 36.8 |

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