Long-term Debt - 2.75% Unsecured Convertible Notes (Details) - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2023	Dec. 31, 2022	May 31, 2020
Debt Instrument [Line Items]
Net carrying amount	$ 2,815.9
2.75% Convertible Notes due 2026 \| Convertible Notes
Debt Instrument [Line Items]
Interest rate	2.75%		2.75%
Debt principal amount			$ 330.5
Number of shares issued upon conversion (in shares)	18,360,815
Amount if-converted value exceeds its principal amount	$ 214.1
Principal	330.5	$ 330.5
Unamortized debt issuance costs	(5.7)	(6.2)
Net carrying amount	$ 324.8	$ 324.3

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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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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The amount by which the convertible debt's if-converted value exceeds its principle amount at the balance sheet date, regardless of whether the instrument is currently convertible. This element applies to public companies only.

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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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Amount, excluding unamortized premium (discount) and debt issuance cost, of long-term debt. Excludes lease obligation.

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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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