Consolidated Statements of Changes in Stockholders' Equity - USD ($) $ in Millions	Total	Common Stock	Treasury Stock	Additional Paid-in Capital	Accumulated Earnings (Deficit)	Accumulated Other Comprehensive Loss
Balance, beginning of period at Dec. 31, 2022	$ 4,206.9	$ 1.6	$ (21.3)	$ 3,720.3	$ 731.4	$ (225.1)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common stock-based award activity	43.0			43.0
Partial exchange of convertible notes due 2025 and partial unwind of capped call transactions. (Note 14)	24.2	0.1		24.1
Capped call settlement and purchase of treasury shares	(7.9)		(23.9)	16.0
Net income (loss)	(100.2)				(100.2)
Other comprehensive income (loss)	7.9					7.9
Balance, end of period at Dec. 31, 2023	4,173.9	1.7	(45.2)	3,803.4	631.2	(217.2)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common stock-based award activity	38.7			38.7
Purchase of treasury shares	(5.3)		(5.3)
Net income (loss)	(1,118.6)				(1,118.6)
Other comprehensive income (loss)	(153.9)					(153.9)
Balance, end of period at Dec. 31, 2024	2,934.8	1.7	(50.5)	3,842.1	(487.4)	(371.1)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common stock-based award activity	40.6	0.1		40.5
Purchase of treasury shares	(174.0)		(174.0)
Net income (loss)	47.0				47.0
Other comprehensive income (loss)	257.9					257.9
Balance, end of period at Dec. 31, 2025	$ 3,106.3	$ 1.8	$ (224.5)	$ 3,882.6	$ (440.4)	$ (113.2)