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Borrowings - Narrative (Details) - USD ($) |  |  |  |  |  |  | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jun. 16, 2021 | May 28, 2021 | May 17, 2021 | May 27, 2020 | Apr. 29, 2020 | May 31, 2019 | Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2020
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |
Less unaccreted debt discount |  |  |  |  |  |  | $ 1,390,000 |  | $ 1,390,000 |  | $ 949,000
Interest |  |  |  |  |  |  |  |  | 17,839,000 | $ 16,415,000 |
Revolving Facility |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |
Borrowing capacity |  |  |  |  |  | $ 800,000,000 |  |  |  |  |
Extension period |  |  |  |  |  | 1 year |  |  |  |  |
Letters of credit outstanding |  |  |  |  |  |  | 7,200,000 |  | 7,200,000 |  |
Amount available to borrow |  |  |  |  |  |  | $ 792,800,000 |  | $ 792,800,000 |  |
Minimum | Revolving Facility |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |
Applicable leverage ratio |  |  |  |  |  |  | 0.00% |  | 0.00% |  |
Maximum | Revolving Facility |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |
Applicable leverage ratio |  |  |  |  |  |  | 1.275% |  | 1.275% |  |
Senior Notes | 2.625% Senior Notes, due June 2031 |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |
Face amount of debt |  | $ 500,000,000.0 |  |  |  |  |  |  |  |  |
Stated interest rate |  |  | 2.625% |  |  |  | 2.625% |  | 2.625% |  |
Proceeds from debt, net |  | 494,700,000 |  |  |  |  |  |  |  |  |
Less unaccreted debt discount |  | 600,000 |  |  |  |  |  |  |  |  |
Underwriting commission |  | 3,300,000 |  |  |  |  |  |  |  |  |
Offering expenses |  | 1,400,000 |  |  |  |  |  |  |  |  |
Redemption price, percentage |  |  | 101.00% |  |  |  |  |  |  |  |
Senior Notes | 2.625% Senior Notes, due June 2031 | Minimum |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |
Percent of notes held |  |  |  |  |  |  | 25.00% |  | 25.00% |  |
Senior Notes | 4.20% Senior Notes, due December 2021 |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |
Stated interest rate |  |  |  |  |  |  | 4.20% |  | 4.20% |  | 4.20%
Extinguishment of debt |  | 350,000,000 | $ 350,000,000 |  |  |  |  |  |  |  |
Redemption premium |  | $ 6,700,000 | 6,700,000 |  |  |  |  |  |  |  |
Amount to be recognized from hedged transactions within 12 months, approximate | $ 1,300,000 |  |  |  |  |  |  |  |  |  |
Write off of deferred debt issuance cost |  |  | 100,000 |  |  |  |  |  |  |  |
Write off of debt remaining discount |  |  | 100,000 |  |  |  |  |  |  |  |
Write off deferred taxes |  |  | $ 400,000 |  |  |  |  |  |  |  |
Loss on early debt redemption |  |  |  |  |  |  | $ 8,600,000 |  | $ 8,600,000 |  |
Senior Notes | 3.00% Senior Notes, due May 2030 |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |
Face amount of debt |  |  |  |  | $ 500,000,000 |  |  |  |  |  |
Stated interest rate |  |  |  |  | 3.00% |  | 3.00% |  | 3.00% |  |
Proceeds from debt, net |  |  |  |  | $ 494,400,000 |  |  |  |  |  |
Less unaccreted debt discount |  |  |  |  | 900,000 |  |  |  |  |  |
Underwriting commission |  |  |  |  | 3,300,000 |  |  |  |  |  |
Offering expenses |  |  |  |  | $ 1,400,000 |  |  |  |  |  |
Senior Notes | 4.5% Senior Notes |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |
Stated interest rate |  |  |  | 4.50% | 4.50% |  | 4.50% |  | 4.50% |  |
Extinguishment of debt |  |  |  | $ 300,000,000 | $ 300,000,000 |  |  |  |  |  |
Redemption premium |  |  |  | 6,800,000 |  |  |  |  |  |  |
Amount to be recognized from hedged transactions within 12 months, approximate |  |  |  | 1,400,000 |  |  |  |  |  |  |
Write off of deferred debt issuance cost |  |  |  | 100,000 |  |  |  |  |  |  |
Write off of debt remaining discount |  |  |  | 100,000 |  |  |  |  |  |  |
Loss on early debt redemption |  |  |  |  |  |  |  | $ 8,400,000 |  | $ 8,400,000 |
Interest |  |  |  | $ 6,100,000 |  |  |  |  |  |  |
Letters of Credit | Revolving Facility |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |
Borrowing capacity |  |  |  |  |  | $ 75,000,000 |  |  |  |  |
Swing Line Loans | Revolving Facility |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |
Borrowing capacity |  |  |  |  |  | $ 50,000,000 |  |  |  |  |

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