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Long-Term Debt - Additional Information (Details) - USD ($) |  | 3 Months Ended | 12 Months Ended |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Dec. 21, 2018 | Dec. 31, 2018 | Jun. 30, 2017 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Sep. 24, 2020 | Mar. 31, 2019 | Mar. 11, 2019 | Jun. 28, 2017 | Sep. 18, 2014 | Apr. 17, 2014
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Unsecured revolving credit facility |  |  |  | $ 0 | $ 100,000,000.0 |  |  |  |  | $ 400,000,000.0 |  | $ 800,000,000.0
Debt instrument, periodic payment, principal |  |  |  |  | 330,000,000.0 |  |  |  |  |  |  |
Proceeds from issuance of debt |  | $ 2,800,000 |  |  |  |  |  |  |  |  |  |
Debt issuance costs |  |  |  |  |  |  |  |  |  | $ 1,600,000 |  |
Write off of deferred debt issuance cost |  |  | $ 200,000 |  |  |  |  |  |  |  |  |
Unsecured term loans |  |  |  | 290,000,000.0 |  |  |  |  |  |  |  |
Outstanding debt balance |  |  |  | 2,095,906,000 | 1,555,343,000 |  |  |  |  |  |  |
Debt instrument, periodic payment, principal | $ 250,000,000.0 |  |  |  |  |  |  |  |  |  |  |
Interest |  |  |  | 52,400,000 | 58,300,000 | $ 38,000,000.0 |  |  |  |  |  |
Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months |  |  |  | 70,000,000.0 |  |  |  |  |  |  |  |
Long-term Debt, Maturities, Repayments of Principal in Year Two |  |  |  | 280,000,000.0 |  |  |  |  |  |  |  |
Long-term Debt, Maturities, Repayments of Principal in Year Three |  |  |  | 210,000,000.0 |  |  |  |  |  |  |  |
Long-term Debt, Maturities, Repayments of Principal in Year Four |  |  |  | 500,000,000.0 |  |  |  |  |  |  |  |
Long-term Debt, Maturities, Repayments of Principal in Year Five |  |  |  | 350,000,000.0 |  |  |  |  |  |  |  |
Long-term Debt, Maturities, Repayments of Principal after Year Five |  |  |  | $ 700,000,000.0 |  |  |  |  |  |  |  |
Minimum |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, variable interest rate |  |  |  | 1.00% |  |  |  |  |  |  |  |
Maximum |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, variable interest rate |  |  |  | 1.75% |  |  |  |  |  |  |  |
Unsecured Senior Notes |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  |  |  |  |  |  |  |  | $ 500,000,000.0 |
Debt instrument interest rate stated percentage |  |  |  |  |  |  | 2.375% |  | 4.50% |  | 4.20% |
Outstanding debt balance |  |  |  | $ 500,000,000.0 | $ 500,000,000.0 |  | $ 200,000,000.0 | $ 350,000,000.0 |  |  |  |
4.500% Senior Notes, Semi-Annual Interest Payments, Balloon Due 2029 |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument interest rate stated percentage |  |  |  | 4.50% | 4.50% |  |  |  |  |  |  |
Senior notes |  |  |  | $ 350,000,000.0 | $ 350,000,000.0 |  |  |  | $ 350,000,000.0 |  |  |
2.375% Senior Note due 2031, Semi-Annual Interest Payments, Balloon Due 2031 |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument interest rate stated percentage |  |  |  | 2.375% | 2.375% |  |  |  |  |  |  |
Senior notes |  |  |  | $ 700,000,000.0 |  |  | $ 700,000,000.0 |  |  |  |  |
Term Loan |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, periodic payment, principal |  | $ 67,500,000 |  |  |  |  |  |  |  |  |  |
Unsecured term loans | $ 300,000,000.0 |  |  | $ 270,000,000.0 | $ 285,000,000.0 |  |  |  |  |  |  |
Loan repayment term | 5 years |  |  |  |  |  |  |  |  |  |  |
Term Loan | LIBOR |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
30-day Adjusted LIBOR Rate |  |  |  | 0.188% |  |  |  |  |  |  |  |
Term Loan | Minimum |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Unsecured term loans | $ 300,000,000.0 |  |  |  |  |  |  |  |  |  |  |
Term Loan | Maximum |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Unsecured term loans | $ 450,000,000.0 |  |  |  |  |  |  |  |  |  |  |
Revolving Credit Facility |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Credit facility, outstanding amount |  |  |  |  |  |  |  |  |  |  | $ 475,000,000.0 |
Long-term Debt | LIBOR |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
30-day Adjusted LIBOR Rate |  |  |  | 0.188% |  |  |  |  |  |  |  |

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