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Debt - 3.5% FLSO Senior Secured Notes due 2028 (Details) - USD ($) $ in Millions			3 Months Ended		9 Months Ended
	Mar. 12, 2024	Feb. 09, 2021	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023	Apr. 16, 2024	Apr. 02, 2024	Dec. 31, 2023
Debt Instrument [Line Items]
Principal balance			$ 2,454.5		$ 2,454.5				$ 2,892.5
Repayment of debt					138.5	$ 151.8
Debt modification costs and gain on debt extinguishment			$ 18.0	$ 55.4	$ 147.2	$ 163.1
3.50% FLSO Senior Secured Notes \| Senior notes
Debt Instrument [Line Items]
Interest rate	3.50%	3.50%	3.50%		3.50%
Aggregate principal amount	$ 267.3						$ 96.9
Principal balance			$ 318.6		$ 318.6		$ 3.6	$ 93.3
Redemption price, percentage		101.00%
Principal amount repurchased and surrendered for cancellation					45.7
Repayment of debt					19.3
Accrued interest increase					0.4
Debt modification costs and gain on debt extinguishment					33.0
Write-off of associated unamortized deferred financing fees					6.3
Fair value of debt			$ 86.4		$ 86.4
3.50% FLSO Senior Secured Notes \| Senior notes \| Prior to September 15, 2025
Debt Instrument [Line Items]
Redemption price, percentage	100.00%
3.50% FLSO Senior Secured Notes \| Senior notes \| Upon change of control
Debt Instrument [Line Items]
Redemption price, percentage	100.00%