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Derivatives - Interest Rate Swaps Outstanding (Details) - USD ($) | Mar. 31, 2021 | Feb. 12, 2021 | Dec. 31, 2020
--- | --- | --- | ---
Interest rate swaps |  |  |
Derivative [Line Items] |  |  |
Derivative, fixed interest rate |  | 2.382% |
Derivative, notional amount | $ 1,350,000,000.0 | $ 900,000,000.0 | $ 2,400,000,000.0
Interest Rate Swap - Entered in December 2016 |  |  |
Derivative [Line Items] |  |  |
Derivative, fixed interest rate |  |  | 1.7625%
Derivative, notional amount |  |  | $ 150,000,000.0
Interest Rate Swap - Entered in December 2016 |  |  |
Derivative [Line Items] |  |  |
Derivative, fixed interest rate | 1.904% |  |
Derivative, notional amount | $ 450,000,000.0 |  | 450,000,000.0
Interest Rate Swap - Entered in December 2016 |  |  |
Derivative [Line Items] |  |  |
Derivative, fixed interest rate | 1.904% |  |
Derivative, notional amount | $ 450,000,000.0 |  | $ 450,000,000.0
Interest Rate Swap - Entered in December 2018 |  |  |
Derivative [Line Items] |  |  |
Derivative, fixed interest rate |  |  | 2.749%
Derivative, notional amount |  |  | $ 150,000,000.0
Interest Rate Swap - Entered in December 2018 |  |  |
Derivative [Line Items] |  |  |
Derivative, fixed interest rate |  |  | 2.735%
Derivative, notional amount |  |  | $ 150,000,000.0
Interest Rate Swap - Entered in December 2018 |  |  |
Derivative [Line Items] |  |  |
Derivative, fixed interest rate |  |  | 2.736%
Derivative, notional amount |  |  | $ 150,000,000.0
Interest Rate Swap - Entered in December 2018 |  |  |
Derivative [Line Items] |  |  |
Derivative, fixed interest rate |  |  | 2.78%
Derivative, notional amount |  |  | $ 900,000,000.0
Interest Rate Swap - Entered in February 2021 |  |  |
Derivative [Line Items] |  |  |
Derivative, fixed interest rate | (1.904%) |  |
Derivative, notional amount | $ (900,000,000.0) |  |
Interest Rate Swap - Entered in February 2021 |  |  |
Derivative [Line Items] |  |  |
Derivative, fixed interest rate | 2.382% |  |
Derivative, notional amount | $ 1,350,000,000.0 |  |

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Nominal or face amount used to calculate payment on derivative. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=121590274&loc=SL5580258-113959 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=121590274&loc=SL5579245-113959 + Details
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