Debt (Narrative) (Details) - USD ($)	Mar. 31, 2020	Dec. 31, 2019
Debt Instrument [Line Items]
Current borrowing capacity	$ 201,200,000
Letters of Credit Outstanding, Amount	103,400,000
Letter of Credit [Member]
Debt Instrument [Line Items]
Maximum borrowing capacity	40,000,000.0	$ 25,000,000.0
Original Senior Unsecured Notes Due 2021 [Member]
Debt Instrument [Line Items]
Debt issuance	617,900,000
Senior Notes	$ 182,100,000	$ 800,000,000.0
Stated interest rate on unsecured senior notes	7.125%	7.125%
New Senior Unsecured Notes Due 2021 [Member]
Debt Instrument [Line Items]
Debt issuance	$ 617,900,000
Debt instrument, new notes as a percentage of original notes	77.24%
Senior Notes	$ 617,900,000
Stated interest rate on unsecured senior notes	7.125%	7.125%
Senior Unsecured Notes Due 2024 [Member]
Debt Instrument [Line Items]
Debt issuance	$ 500,000,000
Stated interest rate on unsecured senior notes	7.75%

Debt instrument, new notes as a percentage of original notes

No definition available.

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- Definition

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

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
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- Definition

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

+ References

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-Publisher FASB
-Name Accounting Standards Codification
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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.

+ References

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.

+ References

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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- 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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- Definition

Including the current and noncurrent portions, carrying value as of the balance sheet date of Notes with the highest claim on the assets of the issuer in case of bankruptcy or liquidation (with maturities initially due after one year or beyond the operating cycle if longer). Senior note holders are paid off in full before any payments are made to junior note holders.

+ References

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