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Long-Term Debt - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020 | Dec. 31, 2020
Debt Instrument [Line Items] |  |  |  |  |
Repayments of Long-term Debt | $ 0.0 | $ 350.0 | $ 359.0 | $ 350.0 |
Line of Credit Facility, Maximum Borrowing Capacity | 550.0 |  | 550.0 |  |
Gain (Loss) on Extinguishment of Debt | 0.0 | $ 0.0 | 11.0 | $ 0.0 |
Redemption Premium | 9.0 |  |  |  |
Write off of Deferred Debt Issuance Cost | $ 2.0 |  |  |  |
Debt Instrument, Redemption Price, Percentage | 102.438% |  |  |  |
Revolving Credit Facility [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Long-term debt, gross | $ 0.0 |  | $ 0.0 |  | $ 0.0
Revolving Credit Facility [Member] | Minimum [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage | 0.20% |  |  |  |
Revolving Credit Facility [Member] | Maximum [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage | 0.425% |  |  |  |
Revolving Credit Facility [Member] | Amended Credit Facility [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Capitalization Ratio, Maximum | 57.50% |  | 57.50% |  |
Debt Covenant, Consolidated Net Worth | $ 475.0 |  | $ 475.0 |  |
Debt Covenant, Consolidated Net Worth, Add On For Consolidated Net Income After Deductions, Percent | 70.00% |  | 70.00% |  |
Revolving Credit Facility [Member] | Amended Credit Facility, A Loan [Member] | Base Rate [Member] | Minimum [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Line of Credit Facility, Interest Rate During Period | 0.50% |  |  |  |
Revolving Credit Facility [Member] | Amended Credit Facility, A Loan [Member] | Base Rate [Member] | Maximum [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Line of Credit Facility, Interest Rate During Period | 1.50% |  |  |  |
Revolving Credit Facility [Member] | Amended Credit Facility, A Loan [Member] | London Interbank Offered Rate (LIBOR) [Member] | Minimum [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Line of Credit Facility, Interest Rate During Period | 1.50% |  |  |  |
Revolving Credit Facility [Member] | Amended Credit Facility, A Loan [Member] | London Interbank Offered Rate (LIBOR) [Member] | Maximum [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Line of Credit Facility, Interest Rate During Period | 2.50% |  |  |  |
Senior Notes [Member] | Senior unsecured notes, maturing 2024 [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Long-term debt, gross | $ 0.0 |  | $ 0.0 |  | 350.0
Senior Notes [Member] | Senior unsecured notes, maturing 2029 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Long-term debt, gross | $ 350.0 |  | $ 350.0 |  | $ 0.0

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- Definition Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=120520924&loc=SL6031897-161870 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910 Reference 3: 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)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 + Details
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