Cash collateral for insurance obligations.

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- Definition

Sublimit for issuance of standby letters of credit

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No definition available.

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Percentage points added to the reference rate to compute the variable rate on the debt instrument.

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No definition available.

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Face (par) amount of debt instrument at time of issuance.

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- Definition

Fair value portion of debt instrument payable, including, but not limited to, notes payable and loans payable.

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- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

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- Definition

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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No definition available.

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Amount of unamortized debt discount (premium) and debt issuance costs.

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- Definition

Gross amount of debt extinguished.

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No definition available.

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- Definition

The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

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No definition available.

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- Definition

Amount of current borrowing capacity under the credit facility considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of current assets), but without considering any amounts currently outstanding under the facility.

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Fair value of the amount outstanding under the credit facility.

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

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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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Amount of cash inflow from contractual arrangement with the lender, including but not limited to, letter of credit, standby letter of credit and revolving credit arrangements.

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Debt (Narrative) (Details) - USD ($)		1 Months Ended	12 Months Ended
Debt (Narrative) (Details) - USD ($)	Dec. 13, 2018	Mar. 31, 2020	Feb. 01, 2020	Jul. 31, 2019	Jun. 30, 2019	Feb. 02, 2019
Debt Instrument [Line Items]
Unamortized discount and debt issuance costs			$ 2,100,000			$ 2,600,000
Amount of borrowings outstanding			0
Collateral trust			56,000,000.0			58,300,000
Unsecured Series A and B Senior Notes
Debt Instrument [Line Items]
Aggregate principal amount of unsecured senior notes			65,000,000
Unsecured Revolving Credit Facility
Debt Instrument [Line Items]
Current borrowing capacity			$ 800,000,000	$ 800,000,000	$ 600,000,000
Sublimit for issuance of standby letters of credit				300,000,000
Maximum borrowing capacity for revolving credit facility (up to)				$ 300,000,000
Interest rate, margin in addition to LIBOR (percent)			7500.00%
Unsecured Revolving Credit Facility \| Subsequent Event
Debt Instrument [Line Items]
Interest rate, margin in addition to LIBOR (percent)		0.75%
Amount borrowed from revolving credit facility		$ 800,000,000
Current interest rate for revolving credit facility borrowings (percent)		1.61%
Standby Letters of Credit
Debt Instrument [Line Items]
Letters of credit			$ 4,200,000			7,300,000
Trade Letters Of Credit
Debt Instrument [Line Items]
Letters of credit			$ 11,200,000			13,300,000
Senior Notes due 2021 \| 6.53% Series B Senior Notes due 2021
Debt Instrument [Line Items]
Unsecured senior notes interest rate (in percentage)			6.53%
Senior Notes due 2024 \| 3.375% Senior Notes due 2024
Debt Instrument [Line Items]
Aggregate principal amount of unsecured senior notes			$ 250,000,000
Unsecured senior notes interest rate (in percentage)			3.375%
Senior Notes due 2018
Debt Instrument [Line Items]
Unsecured senior notes interest rate (in percentage)	6.38%
Senior Notes due 2018 \| Series A Unsecured Senior Notes
Debt Instrument [Line Items]
Extinguishment of debt	$ 85,000,000
Level 1
Debt Instrument [Line Items]
Unsecured senior notes estimated fair value			$ 335,000,000			$ 316,000,000