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Borrowings - Narrative (Details) |  |  |  |  |  | 3 Months Ended |  |
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May 27, 2020 USD ($) | Apr. 29, 2020 USD ($) | May 31, 2019 USD ($) | Jun. 23, 2015 USD ($) | Dec. 09, 2011 USD ($) | Mar. 31, 2021 USD ($) | Jun. 30, 2020 USD ($) | Mar. 31, 2020 USD ($) | Dec. 31, 2020 USD ($) | Jun. 13, 2016 USD ($)
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |
Less unaccreted debt discount |  |  |  |  |  | $ 903,000 |  |  | $ 949,000 |
Interest |  |  |  |  |  | $ 483,000 |  | $ 276,000 |  |
For 12 Months in Connection with Certain Acquisitions |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |
Leverage ratio |  |  |  |  |  | 4.00 |  |  |  |
Revolving Facility |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |
Debt instrument, term |  |  |  | 5 years |  |  |  |  |  |
Borrowing capacity |  |  | $ 800,000,000 | $ 700,000,000 |  |  |  |  |  |
Extension period |  |  | 1 year |  |  |  |  |  |  |
Applicable margin |  |  |  |  |  | 1.00% |  |  |  |
Weighted average interest rate |  |  |  |  |  | 1.19% |  |  |  |
Debt outstanding |  |  |  |  |  | $ 0 |  |  |  |
Letters of Credit Outstanding, Amount |  |  |  |  |  | 7,100,000 |  |  |  |
Amount available to borrow |  |  |  |  |  | $ 792,900,000 |  |  |  |
Minimum |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |
Required percent for prepayment amount of aggregate principal amount |  |  |  |  |  |  |  |  |  | 5.00%
Minimum | Revolving Facility |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |
Applicable leverage ratio |  |  |  |  |  | 0.00% |  |  |  |
Maximum | Revolving Facility |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |
Aggregate lending commitments |  |  | $ 400,000,000 |  |  |  |  |  |  |
Applicable leverage ratio |  |  |  |  |  | 1.275% |  |  |  |
4.20% Senior Notes, due December 2021 |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |
Stated interest rate |  |  |  |  |  | 4.20% |  |  |  |
Revolving Facility | Minimum |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |
Interest coverage ratio |  |  |  |  |  | 3.0 |  |  |  |
Revolving Facility | Maximum |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |
Leverage ratio |  |  |  |  |  | 3.50 |  |  |  |
Senior Notes | Maximum |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |
Limitation of outstanding principal of higher preference debt as percent of consolidated assets |  |  |  |  |  | 15.00% |  |  |  |
Senior Notes | 3.00% Senior Notes, due May 2030 |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |
Face amount of debt |  | $ 500,000,000.0 |  |  |  |  |  |  |  |
Stated interest rate |  | 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 |  |  |  |  |  |  |  |
Redemption price, percentage |  | 101.00% |  |  |  |  |  |  |  |
Senior Notes | 3.00% Senior Notes, due May 2030 | Minimum |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |
Percent of outstanding amount owned for decision making |  | 25.00% |  |  |  |  |  |  |  |
Senior Notes | 4.5% Senior Notes |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |
Stated interest rate | 4.50% | 4.50% |  |  |  | 4.50% |  |  |  |
Extinguishment of debt | $ 300,000,000.0 | $ 300,000,000.0 |  |  |  |  |  |  |  |
Redemption premium | 6,800,000 |  |  |  |  |  |  |  |  |
Interest | 6,100,000 |  |  |  |  |  |  |  |  |
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 |  |  |
Senior Notes | 4.20% Senior Notes, due December 2021 |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |
Stated interest rate |  |  |  |  | 4.20% | 4.20% |  |  | 4.20% |
Underwriting commission |  |  |  |  | $ 2,300,000 |  |  |  |  |
Offering expenses |  |  |  |  | 600,000 |  |  |  |  |
Proceeds from issuance of debt |  |  |  |  | 350,000,000.0 | $ 350,000,000.0 |  |  |  |
Net proceeds from debt offering |  |  |  |  | 346,200,000 |  |  |  |  |
Debt offering initial discount |  |  |  |  | 900,000 |  |  |  |  |
Outstanding repayment of indebtedness under credit facility |  |  |  |  | $ 306,000,000.0 |  |  |  |  |
Percentage of principal amount plus accrued and unpaid interest |  |  |  |  | 101.00% |  |  |  |  |
Senior Notes | 3.20% Senior Notes, due June 2023 |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |
Face amount of debt |  |  |  |  |  |  |  |  |  | $ 100,000,000
Stated interest rate |  |  |  |  |  | 3.20% |  |  | 3.20% | 3.20%
Senior Notes | 3.37% Senior Notes, due June 2025 |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |
Face amount of debt |  |  |  |  |  |  |  |  |  | $ 100,000,000
Stated interest rate |  |  |  |  |  | 3.37% |  |  | 3.37% | 3.37%
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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