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Basis of Presentation and Significant Accounting Policies - Narrative (Details) $ / shares in Units, £ in Thousands |  |  | 1 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Sep. 25, 2020 USD ($) $ / shares shares | Aug. 28, 2020 USD ($) $ / shares | Mar. 31, 2020 USD ($) | Sep. 30, 2020 USD ($) | Apr. 02, 2020 USD ($) | Nov. 30, 2018 GBP (£)
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |
Dividends payable (USD per share) | $ / shares |  | $ 1.50 |  |  |  |
Dividends payable | $ |  | $ 392,489,000 |  |  |  |
Stock options exercise price reduction (USD per share) | $ / shares |  | $ 1.50 |  |  |  |
Stock options exercise price, lower limit (USD per share) | $ / shares |  | $ 0.01 |  |  |  |
Not Designated as Hedging Instrument |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |
Derivative notional amount | £ |  |  |  |  |  | £ 65,000
Interest Rate Swap | Not Designated as Hedging Instrument |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |
Derivative notional amount | $ |  |  | $ 200,000,000 |  | $ 200,000,000 |
Term of contract (in years) |  |  | 10 years |  |  |
Public Stock Offering - Shares From Existing Shareholders |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |
Payments of expenses associated with initial public offering | $ |  |  |  | $ 26,130,000 |  |
Public Stock Offering - Shares From Existing Shareholders | Class B Common Stock |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |
Number of shares sold (in shares) | shares | 12,360,991 |  |  |  |  |
Price per share sold (USD per share) | $ / shares | $ 22.00 |  |  |  |  |
IPO | Class B Common Stock |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |
Number of shares sold (in shares) | shares | 0 |  |  |  |  |
Sale of stock, consideration received | $ | $ 0 |  |  |  |  |

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