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Debt (Textual) (Details) - USD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Oct. 23, 2020
Debt Instrument [Line Items] |  |  |  |
Maximum amount borrowed | $ 1,157,200,000 |  |  |
Loss due to debt prepayment, reclassified into earnings | 2,800,000 |  |  |
Write off of debt issuance cost | 300,000 |  |  |
Interest paid | 51,600,000 | $ 59,600,000 | $ 29,600,000 |
Unused capacity | $ 728,600,000 |  |  |
Short-term Debt, Weighted Average Interest Rate, at Point in Time | 1.66% | 3.24% |  |
Estimated fair value |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Fair value of long-term debt | $ 1,026,800,000 | $ 1,096,000,000.0 |  |
Recourse |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Aggregate annual maturities of long term debt, 2019 | 69,000,000.0 |  |  |
Aggregate annual maturities of long term debt, 2020 | 57,000,000.0 |  |  |
Aggregate annual maturities of long term debt, 2021 | 65,200,000 |  |  |
Aggregate annual maturities of long term debt, 2022 | 143,600,000 |  |  |
Aggregate annual maturities of long term debt, 2023 | 44,600,000 |  |  |
Aggregate annual maturities of long term debt thereafter | 468,200,000 |  |  |
Non-recourse |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Aggregate annual maturities of long term debt, 2019 | 6,400,000 |  |  |
Aggregate annual maturities of long term debt, 2020 | 15,500,000 |  |  |
Aggregate annual maturities of long term debt, 2021 | 11,600,000 |  |  |
Aggregate annual maturities of long term debt, 2022 | 74,900,000 |  |  |
Aggregate annual maturities of long term debt, 2023 | 10,500,000 |  |  |
Aggregate annual maturities of long term debt thereafter | $ 32,500,000 |  |  |
Loans Payable [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Face amount |  |  |  | $ 150,000,000.0

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- Definition Amount of cash paid for interest, excluding capitalized interest, classified as operating activity. Includes, but is not limited to, payment to settle zero-coupon bond for accreted interest of debt discount and debt instrument with insignificant coupon interest rate in relation to effective interest rate of borrowing attributable to accreted interest of debt discount. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4297-108586 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 17 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3367-108585 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 25 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3536-108585 + Details
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