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Debt and Credit Arrangements - Carrying Value and Fair Value Disclosures (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Term Loan | Term loans due March 2030
Debt Instrument
Carrying Value	$ 1,517.4	$ 1,562.7
Fair Value	1,589.9	1,631.0
Secured Debt | Senior secured notes due 2030
Debt Instrument
Carrying Value	1,425.6	1,420.2
Fair Value	1,517.9	1,533.0
Unsecured Debt | Senior unsecured notes due 2031
Debt Instrument
Carrying Value	492.2	490.0
Fair Value	546.9	555.9
Convertible Debt | Convertible notes due November 2024
Debt Instrument
Carrying Value	0.0	257.8
Fair Value	$ 0.0	$ 604.5

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