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Debt and Credit Arrangements - Carrying Value and Fair Value Disclosures (Details) - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023
Secured Debt | Senior secured notes due 2030
Debt Instrument
Carrying Value	$ 1,421.5	$ 1,420.2
Fair Value	1,518.4	1,533.0
Unsecured Debt | Senior unsecured notes due 2031
Debt Instrument
Carrying Value	490.5	490.0
Fair Value	555.9	555.9
Convertible Debt | Convertible notes due November 2024
Debt Instrument
Carrying Value	258.1	257.8
Fair Value	729.5	605.4
Term Loan | Term loans due March 2030 | Revolving Credit Facility
Debt Instrument
Carrying Value	1,564.8	1,562.7
Fair Value	$ 1,631.0	$ 1,631.0

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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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