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Debt and Credit Arrangements - Carrying Value and Fair Value Disclosures (Details) - USD ($) $ in Millions	Sep. 30, 2024	Dec. 31, 2023
Term Loan | Term loans due March 2030 | Revolving Credit Facility
Debt Instrument
Carrying Value	$ 1,565.1	$ 1,562.7
Fair Value	1,618.8	1,631.0
Secured Debt | Senior secured notes due 2030
Debt Instrument
Carrying Value	1,424.2	1,420.2
Fair Value	1,540.5	1,533.0
Unsecured Debt | Senior unsecured notes due 2031
Debt Instrument
Carrying Value	491.6	490.0
Fair Value	556.0	555.9
Convertible Debt | Convertible notes due November 2024
Debt Instrument
Carrying Value	258.5	257.8
Fair Value	$ 541.3	$ 605.4

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