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Senior Notes (Narrative) (Details) - USD ($) $ in Millions |  | 3 Months Ended
--- | --- | ---
May 31, 2018 | Mar. 31, 2022 | Mar. 31, 2021
Debt Instrument [Line Items] |  |  |
Redemption period |  | 180 days |
Senior Notes 4.25% |  |  |
Debt Instrument [Line Items] |  |  |
Debt Instrument, Term |  | 86 months |
Senior Notes |  |  |
Debt Instrument [Line Items] |  |  |
Long-term Debt, Fair Value |  | $ 373.4 |
Senior Notes | Period One |  |  |
Debt Instrument [Line Items] |  |  |
Redemption price percentage | 102.13% |  |
Senior Notes | Period Two |  |  |
Debt Instrument [Line Items] |  |  |
Redemption price percentage | 101.06% |  |
Senior Notes | Period Four |  |  |
Debt Instrument [Line Items] |  |  |
Percentage of principal amount redeemed | 40.00% |  |
Senior Notes | Period Five |  |  |
Debt Instrument [Line Items] |  |  |
Redemption price percentage | 104.25% | 101.00% |
Senior Notes | Period Six |  |  |
Debt Instrument [Line Items] |  |  |
Redemption price percentage |  | 100.00% |
Percentage of principal amount redeemed | 50.00% |  |
Senior Note Two | Senior Notes 4.25% |  |  |
Debt Instrument [Line Items] |  |  |
Stated interest rate percentage |  | 4.25% |
Senior Note Two | Senior Notes |  |  |
Debt Instrument [Line Items] |  |  |
Debt Instrument, Unamortized Debt Issuance Costs |  | 4.30% | 6.88%
Senior Note One | Senior Notes |  |  |
Debt Instrument [Line Items] |  |  |
Debt Instrument, Discount Rate |  | 4.42% |
Debt Instrument, Unamortized Debt Issuance Costs |  |  | 6.69%

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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 1B -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123466505&loc=SL123495323-112611 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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- Definition Percentage price of original principal amount of debt at which debt can be redeemed by the issuer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 50 -Paragraph 3 -Subparagraph e -URI http://asc.fasb.org/extlink&oid=123599511&loc=d3e64711-112823 + Details
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- Definition Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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