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

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

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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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Fair value amount of debt instrument that was repurchased.

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Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Fixed interest rate related to the interest rate derivative.

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Nominal or face amount used to calculate payment on derivative.

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The gain (loss) is the pre-tax difference between the net condemnation award and the entity's adjusted basis of the condemned property.

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The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

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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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The cash outflow during the period from the repayment of aggregate short-term and long-term debt. Excludes payment of capital lease obligations.

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Debt (Narrative) (Details) - USD ($)	6 Months Ended
Debt (Narrative) (Details) - USD ($)	Jun. 30, 2021	May 31, 2021	Dec. 31, 2020
Debt Instrument [Line Items]
Principal amount	$ 2,470,678,000		$ 2,610,246,000
Interest rate swaps
Debt Instrument [Line Items]
Derivative notional amount	200,000,000	$ 500,000,000
Fixed interest rate		0.56%
Notes due
Debt Instrument [Line Items]
Pre-tax gain	52,000,000
Line of credit \| Revolving credit facility
Debt Instrument [Line Items]
Principal amount	380,000,000
Maximum borrowing capacity	500,000,000
Outstanding borrowings	0
Notes due March 2027 \| Notes due
Debt Instrument [Line Items]
Principal amount	$ 400,000,000		0
Interest rate	6.875%
Notes due March 2029 \| Notes due
Debt Instrument [Line Items]
Principal amount	$ 350,000,000		0
Interest rate	7.25%
Term loan due March 2028 \| Notes due
Debt Instrument [Line Items]
Principal amount	$ 448,875,000		0
Loan amount	$ 450,000,000
Interest rate	4.10%
Debt term	7 years
Notes due October 2021 \| Notes due
Debt Instrument [Line Items]
Principal amount	$ 0		152,588,000
Interest rate	4.875%
Debt redeemed	$ 153,000,000
Notes due May 2022 \| Notes due
Debt Instrument [Line Items]
Principal amount	$ 72,447,000		148,792,000
Interest rate	5.625%
Debt redeemed	$ 363,000,000
Notes due April 2023 \| Notes due
Debt Instrument [Line Items]
Principal amount	$ 93,394,000		271,000,000
Interest rate	6.20%
Debt redeemed	$ 363,000,000
Notes due March 2024 \| Notes due
Debt Instrument [Line Items]
Principal amount	$ 260,826,000		374,000,000
Interest rate	4.625%
Debt redeemed	$ 363,000,000
Term loan due January 2025 \| Notes due
Debt Instrument [Line Items]
Principal amount	0		818,125,000
Repayments of debt	818,000,000
Term loan due March 2026 \| Notes due
Debt Instrument [Line Items]
Principal amount	$ 380,000,000		$ 380,000,000
Interest rate	1.90%