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Long-Term Debt - Narrative (Details) - USD ($) $ in Millions |  | 1 Months Ended | 3 Months Ended |
--- | --- | --- | --- | ---
May 01, 2020 | Sep. 30, 2016 | Mar. 31, 2020 | Mar. 31, 2019 | Dec. 31, 2019
Debt Instrument [Line Items] |  |  |  |  |
Line of Credit Capacity, Sublimit for Letters of Credit |  |  |  |  | $ 60
Proceeds from Issuance of Long-term Debt |  |  | $ 350 | $ 0 |
Base Rate [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Line of Credit Facility, Interest Rate During Period |  |  | 0.50% |  |
Base Rate [Member] | Minimum [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Line of Credit Facility, Interest Rate During Period |  |  | 0.875% |  |
Base Rate [Member] | Maximum [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Line of Credit Facility, Interest Rate During Period |  |  | 2.00% |  |
London Interbank Offered Rate (LIBOR) [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Line of Credit Facility, Interest Rate During Period |  |  | 1.00% |  |
London Interbank Offered Rate (LIBOR) [Member] | Minimum [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Line of Credit Facility, Interest Rate During Period |  |  | 1.875% |  |
London Interbank Offered Rate (LIBOR) [Member] | Maximum [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Line of Credit Facility, Interest Rate During Period |  |  | 3.00% |  |
Other Commitments [Domain] | Minimum [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Line of Credit Facility, Interest Rate During Period |  |  | 0.30% |  |
Other Commitments [Domain] | Maximum [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Line of Credit Facility, Interest Rate During Period |  |  | 0.60% |  |
Revolving Credit Facility [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Long-term debt, gross |  |  | $ 350 |  | 0
Line of Credit Facility, Interest Rate at Period End |  |  | 2.70% |  |
Senior Notes [Member] | Senior unsecured notes, maturing 2024 [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Long-term debt, gross |  |  | $ 350 |  | $ 350
Debt Instrument, Change In Control, Repurchase Price Percentage |  | 101.00% |  |  |
Holders Of Aggregate Principal Amount Required To Accelerate Amounts Due, Percent |  | 25.00% |  |  |
Subsequent Event [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity | $ 200 |  |  |  |
Subsequent Event [Member] | Revolving Credit Facility [Member] | Amended Credit Facility [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Capitalization Ratio, Maximum | 57.50% |  |  |  |
Debt Covenant, Consolidated Net Worth | $ 475 |  |  |  |
Debt Covenant, Consolidated Net Worth, Add On For Consolidated Net Income After Deductions, Percent | 70.00% |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity | $ 200 |  |  |  |
Subsequent Event [Member] | Revolving Credit Facility [Member] | Amended Credit Facility [Member] | Base Rate [Member] | Minimum [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Line of Credit Facility, Interest Rate During Period | 1.125% |  |  |  |
Subsequent Event [Member] | Revolving Credit Facility [Member] | Amended Credit Facility [Member] | Base Rate [Member] | Maximum [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Line of Credit Facility, Interest Rate During Period | 2.25% |  |  |  |
Subsequent Event [Member] | Revolving Credit Facility [Member] | Amended Credit Facility [Member] | London Interbank Offered Rate (LIBOR) [Member] | Minimum [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Line of Credit Facility, Interest Rate During Period | 2.125% |  |  |  |
Subsequent Event [Member] | Revolving Credit Facility [Member] | Amended Credit Facility [Member] | London Interbank Offered Rate (LIBOR) [Member] | Maximum [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Line of Credit Facility, Interest Rate During Period | 3.25% |  |  |  |

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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=109500613&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=119400593&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=6877327&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=6876686&loc=d3e534808-122878 + Details
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