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Debt - Additional Information (Details) - USD ($) | 1 Months Ended | 3 Months Ended | 6 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Jun. 30, 2019 | Mar. 31, 2021 | Jun. 30, 2021 | Dec. 31, 2017 | Dec. 31, 2015 | Jan. 28, 2021 | Dec. 31, 2020 | May 31, 2019
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Borrowings |  |  | $ 904,500,000 |  |  |  | $ 925,500,000 |
Senior unsecured credit facility- revolving loan due 2021 |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  |  |  |  | $ 700,000,000
Senior unsecured credit facility- revolving loan due 2024 |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Maximum borrowing capacity | $ 1,000,000,000 |  |  |  |  |  |  |
Debt instrument expiration period | 2024-06 |  |  |  |  |  |  |
Debt instrument, interest rate terms |  |  | The interest rate ranges from LIBOR + 0.875% to a maximum of LIBOR + 1.50%, depending upon the better of the Company’s leverage ratio or the credit rating. |  |  |  |  |
Maximum amount available under credit facility agreement to issue letters of credit |  |  | $ 50,000,000 |  |  |  |  |
Letters of credit issued under credit facility |  |  | 0 |  |  |  |  |
Undrawn availability under credit facility |  |  | $ 543,000,000 |  |  |  |  |
Weighted average interest rate |  |  | 4.04% |  |  |  |  |
Senior unsecured credit facility- revolving loan due 2024 | Level 2 |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Borrowings |  |  | $ 207,000,000 |  |  |  |  |
Senior unsecured credit facility- revolving loan due 2024 | Minimum |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Credit facility interest rate basis | LIBOR + 0.875% |  |  |  |  |  |  |
Spread on variable interest rate basis | 0.875% |  |  |  |  |  |  |
Senior unsecured credit facility- revolving loan due 2024 | Maximum |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Credit facility interest rate basis | LIBOR + 1.50% |  |  |  |  |  |  |
Spread on variable interest rate basis | 1.50% |  |  |  |  |  |  |
Amended senior unsecured credit facility- revolving loan due 2024 |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  |  | $ 750,000,000 |  |
Debt instrument, covenant terms |  |  | On January 28, 2021, we further amended the Facility agreement (the “Second Amendment”) to provide that, from January 28, 2021 through and including March 31, 2022, we will not be subject to a maximum leverage ratio covenant but will instead be required to maintain Liquidity (as defined in the Facility agreement) of at least $250 million. Additionally, during such period, the Company will be subject to limitations on share repurchases, cash dividends, and its ability to incur secured debt, in each case subject to certain exceptions; the applicable margin and commitment fees are increased; the incremental facility will not be available; and if the Company’s public debt rating is downgraded to (i) BB or lower by Standard & Poor’s and (ii) Ba2 or lower by Moody’s, we will be required to grant liens on certain of our assets, which liens will be released upon the Company’s public debt rating being upgraded to BB+ or higher by Standard & Poor’s or Ba1 or higher by Moody’s. The Company’s public debt rating as of June 30, 2021 is BB+/Baa3. |  |  |  |  |
Minimum liquidity amount required to maintain under credit agreement liquidity covenant |  |  |  |  |  | $ 250,000,000 |  |
Interest expense |  | $ 900,000 |  |  |  |  |  |
3.95% senior unsecured notes due 2027 |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Face value |  |  |  | $ 400,000,000 |  |  |  |
Debt instrument, interest rate |  |  | 3.95% | 3.95% |  |  |  |
Debt instrument, maturity year |  |  |  | 2027 |  |  |  |
Increase in senior notes interest rate |  |  |  | 0.25% |  |  |  |
Effective interest rate |  |  | 4.06% |  |  |  |  |
3.95% senior unsecured notes due 2027 | Treasury Lock | Interest Lock Agreement |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Percentage of effective interest rate benefit |  |  | 0.25% |  |  |  |  |
3.95% senior unsecured notes due 2027 | Level 2 |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Fair value of senior unsecured notes |  |  | $ 428,000,000.0 |  |  |  |  |
3.95% senior unsecured notes due 2027 | Maximum |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt instrument, interest rate |  |  |  | 5.95% |  |  |  |
4.7% senior unsecured notes due 2025 |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Face value |  |  |  |  | $ 300,000,000 |  |  |
Debt instrument, interest rate |  |  |  |  | 4.70% |  |  |
Debt instrument, maturity year |  |  |  |  | 2025 |  |  |
Increase in senior notes interest rate |  |  |  |  | 0.25% |  |  |
Effective interest rate |  |  | 5.01% |  |  |  |  |
4.7% senior unsecured notes due 2025 | Level 2 |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Fair value of senior unsecured notes |  |  | $ 330,200,000 |  |  |  |  |
4.7% senior unsecured notes due 2025 | Maximum |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt instrument, interest rate |  |  |  |  | 6.70% |  |  |

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