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- Definition

Debt Covenant, Consolidated Net Worth

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- Definition

Debt Covenant, Consolidated Net Worth, Add On For Consolidated Net Income After Deductions, Percent

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- Definition

Debt Instrument, Change In Control, Repurchase Price Percentage

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- Definition

Holders Of Aggregate Principal Amount Required To Accelerate Amounts Due, Percent

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- Definition

Line of Credit Capacity, Sublimit for Letters of Credit

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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.

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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.

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- Definition

The effective interest rate at the end of the reporting period.

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The effective interest rate during the reporting period.

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- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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The cash inflow from a debt initially having maturity due after one year or beyond the operating cycle, if longer.

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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%