Amount of accumulated amortization of debt issuance costs.

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The number of shares issued in exchange for the original debt being converted in a noncash (or part noncash) transaction. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or payments in the period.

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

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The price per share of the conversion feature embedded in the debt instrument.

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Threshold period of specified consecutive trading days within which common stock price to conversion price of convertible debt instrument must exceed threshold percentage for specified number of trading days to trigger conversion feature.

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Minimum percentage of common stock price to conversion price of convertible debt instruments to determine eligibility of conversion.

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Threshold number of specified trading days that common stock price to conversion price of convertible debt instruments must exceed threshold percentage within a specified consecutive trading period to trigger conversion feature.

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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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Percentage price of original principal amount of debt at which debt can be redeemed by the issuer.

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Percentage of principal amount of debt redeemed.

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Amount, after accumulated amortization, of debt discount.

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Amount, before accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

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Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

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The percentage points added to the reference rate to compute the variable rate on the interest rate derivative.

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Gross amount of debt extinguished.

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Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity.

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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 fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission.

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No definition available.

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Number of common shares issuable upon conversion for each share of preferred stock to be converted.

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The cash inflow from additional borrowings, net of cash paid to third parties in connection with debt origination.

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The cash inflow from amounts received from issuance of long-term debt that is wholly or partially secured by collateral. Excludes proceeds from tax exempt secured debt.

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The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer.

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Number of shares issued during the period as a result of the conversion of convertible securities.

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The remaining balance of debt issuance expenses that were capitalized and are being amortized against income over the lives of the respective bond issues. This does not include the amounts capitalized as part of the cost of the utility plant or asset.

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Debt Instrument, Basis Spread On Variable Rate, Calculation Denominator

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Debt Instrument, Contingent Interest Period

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Debt Instrument, Convertible, Threshold Percentage Of Product Of Stock Price And Conversion Rate

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Debt Instrument, Covenant compliance, Contingent Interest, Minimum Trading Price Per Principal Amount

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Debt Instrument, Covenant, EBITDA Minimum

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Debt Instrument, Covenant, Leverage Ratio, Minimum

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Debt Instrument, Maturity Date, Period After Funding Date

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Debt Instrument, Trading Period

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Extinguishment Of Debt, Principle Amount

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Line Of Credit Facility, Increase Available

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Line Of Credit Facility, Maximum Borrowing Capacity Including Increases

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Debt (Narrative) (Details)						1 Months Ended		3 Months Ended		9 Months Ended
Debt (Narrative) (Details)	Jun. 10, 2022 USD ($)	Apr. 07, 2021 USD ($)	Oct. 07, 2020 USD ($) fiscalQuarterPeriod	Nov. 15, 2019 USD ($) tradingDay	Jun. 10, 2014 USD ($)	Sep. 30, 2022 USD ($) $ / shares shares	Jun. 30, 2022 USD ($) shares	Sep. 30, 2022 USD ($) $ / shares shares	Sep. 30, 2021 USD ($) shares	Sep. 30, 2022 USD ($) $ / shares shares	Sep. 30, 2021 USD ($) shares	Sep. 15, 2022 USD ($)	Jan. 01, 2022 USD ($)	Dec. 31, 2021 USD ($)
Debt Instrument [Line Items]
Cash tender offer (maximum)								$ 22,300,000		$ 112,300,000
Gain on debt extinguishment, net								10,112,000	$ 0	11,505,000	$ 0
Unamortized discount						$ 2,837,000		2,837,000		2,837,000				$ 91,593,000
Deferred issuance costs						$ 8,702,000		$ 8,702,000		8,702,000				9,056,000
Repayments of long-term debt										166,904,000	402,414,000
Proceeds from bridge loan										$ 0	485,000,000
Shares issued in debt-for-equity exchange (in shares) \| shares						500,000	2,300,000	500,000		2,800,000
Revolving Credit Facility
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity		$ 100,000,000
Increase available		250,000,000
Total aggregate commitment		$ 350,000,000
Long-term line of credit						$ 0		$ 0		$ 0				0
4.625% Senior Notes \| Senior Notes
Debt Instrument [Line Items]
Stated interest rate			4.625%
Percentage principal outstanding to be eligible for redemption			50.00%
Covenant, leverage ratio, minimum			3.5
Covenant restricted payment threshold			$ 250,000,000
Covenant, EBITDA minimum			50.00%
Covenant, EBITDA minimum, fiscal quarter period \| fiscalQuarterPeriod			4
Extinguishment of debt, principle amount								105,100,000		181,200,000
Cash tender offer (maximum)								94,100,000		167,700,000
Gain on debt extinguishment, net								10,200,000		12,100,000
Fair value of debt instruments						$ 378,300,000		$ 378,300,000		$ 378,300,000				659,900,000
Debt instrument, face amount			$ 750,000,000
Proceeds from debt, net of issuance costs			$ 742,700,000
4.625% Senior Notes \| Senior Notes \| Debt Instrument, Redemption, Period One
Debt Instrument [Line Items]
Percentage of principal amount redeemed			40.00%
Redemption price, percentage			104.625%
4.625% Senior Notes \| Senior Notes \| Debt Instrument, Redemption, Period Two
Debt Instrument [Line Items]
Redemption price, percentage			100.00%
1.75% Convertible Notes \| Convertible Debt
Debt Instrument [Line Items]
Stated interest rate				1.75%									1.75%
Preferred stock, convertible, conversion ratio						0.0093783		0.0093783		0.0093783
Fair value of debt instruments						$ 513,600,000		$ 513,600,000		$ 513,600,000				$ 685,400,000
Debt instrument, face amount				$ 550,000,000
Proceeds from debt, net of issuance costs				537,100,000
Convertible debt conversion price (in usd per share) \| $ / shares						$ 106.63		$ 106.63		$ 106.63
Gross debt issuance costs				12,900,000
Accumulated amortization of debt issuance costs				10,100,000
Deferred issuance costs				$ 2,800,000
Unamortized debt issuance expense						$ 7,800,000		$ 7,800,000		$ 7,800,000
1.75% Convertible Notes \| Convertible Debt \| Cumulative Effect, Period of Adoption, Adjustment
Debt Instrument [Line Items]
Unamortized discount													$ 87,300,000
1.75% Convertible Notes \| Convertible Debt \| Debt Instrument, Redemption, Period One
Debt Instrument [Line Items]
Convertible debt threshold trading days \| tradingDay				20
Convertible debt threshold consecutive trading days \| tradingDay				30
Percentage of stock price				130.00%
1.75% Convertible Notes \| Convertible Debt \| Debt Instrument, Redemption, Period Two
Debt Instrument [Line Items]
Convertible debt threshold trading days \| tradingDay				5
Convertible debt threshold consecutive trading days \| tradingDay				10
Percentage of product of stock price and conversion rate				98.00%
3.25% Convertible Notes \| Convertible Debt
Debt Instrument [Line Items]
Stated interest rate					3.25%
Debt instrument, face amount					$ 402,500,000
Debt instrument, contingent interest period					6 months
Debt instrument, trading period					5 days
Price per principal amount					$ 1,300
Repayments of long-term debt									$ 399,600,000		$ 402,400,000
Redemption of 3.25% Convertible Note including tax impact (in shares) \| shares									3,031,817		3,050,850
6.0% Senior Notes \| Senior Notes
Debt Instrument [Line Items]
Stated interest rate			6.00%
Bridge Loan Facility \| Base Rate \| Minimum
Debt Instrument [Line Items]
Basis spread on variable rate		0.50%
Bridge Loan Facility \| Base Rate \| Maximum
Debt Instrument [Line Items]
Basis spread on variable rate		1.25%
Bridge Loan Facility \| LIBOR \| Minimum
Debt Instrument [Line Items]
Basis spread on variable rate		1.50%
Bridge Loan Facility \| LIBOR \| Maximum
Debt Instrument [Line Items]
Basis spread on variable rate		2.25%
Bridge Loan Facility \| Bridge Loan \| LIBOR
Debt Instrument [Line Items]
Basis spread on variable rate		1.00%
Calculation denominator		1.00
Bridge Loan Facility \| Bridge Loan \| Federal Funds Effective Rate
Debt Instrument [Line Items]
Basis spread on variable rate		0.50%
Revolving Credit Facility \| Secured Debt
Debt Instrument [Line Items]
Gain on debt extinguishment, net								(100,000)		$ (600,000)
Debt instrument, face amount	$ 90,000,000											$ 22,300,000
Credit Agreement \| Line of Credit \| Secured Debt
Debt Instrument [Line Items]
Cash tender offer (maximum)								$ 22,300,000
Debt instrument, face amount	$ 90,000,000											$ 22,300,000
Maturity date, period after funding date	60 days
Proceeds from bridge loan						$ 22,300,000	$ 90,000,000
Credit Agreement \| Line of Credit \| Secured Debt \| LIBOR
Debt Instrument [Line Items]
Basis spread on variable rate	1.00%
Credit Agreement \| Line of Credit \| Secured Debt \| Federal Funds Effective Rate
Debt Instrument [Line Items]
Basis spread on variable rate	0.50%