Unaudited condensed consolidated statements of stockholders' equity - amounts - USD ($) $ in Millions	Total	Common stock including paid-in capital	Accumulated earnings	Treasury stock	AOCI
Beginning balance at Dec. 31, 2024	$ 5,956.7	$ 3,937.7	$ 2,203.0	$ 0.0	$ (184.0)
Comprehensive loss	(422.2)		(582.6)		160.4
Stock-based compensation expense	36.2	36.2
Stock option exercises and other common stock transactions	(0.5)	(0.5)
Ending balance at Sep. 30, 2025	5,570.2	3,973.4	1,620.4	0.0	(23.6)
Beginning balance at Jun. 30, 2025	6,285.9	3,964.1	2,332.2	0.0	(10.4)
Comprehensive loss	(725.0)		(711.8)		(13.2)
Stock-based compensation expense	7.4	7.4
Stock option exercises and other common stock transactions	1.9	1.9
Ending balance at Sep. 30, 2025	5,570.2	3,973.4	1,620.4	0.0	(23.6)
Beginning balance at Dec. 31, 2025	5,565.0	3,984.8	1,672.8	(75.7)	(16.9)
Comprehensive loss	225.2		284.8		(59.6)
Stock-based compensation expense	36.1	36.1
Stock option exercises and other common stock transactions	9.6	9.6
Ending balance at Sep. 30, 2026	5,835.9	4,030.5	1,957.6	(75.7)	(76.5)
Beginning balance at Jun. 30, 2026	5,630.2	4,006.9	1,754.2	(75.7)	(55.2)
Comprehensive loss	182.1		203.4		(21.3)
Stock-based compensation expense	11.9	11.9
Stock option exercises and other common stock transactions	11.7	11.7
Ending balance at Sep. 30, 2026	$ 5,835.9	$ 4,030.5	$ 1,957.6	$ (75.7)	$ (76.5)