Unaudited condensed consolidated statements of comprehensive income or loss - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2026	Sep. 30, 2025	Sep. 30, 2026	Sep. 30, 2025
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ 203.4	$ (711.8)	$ 284.8	$ (582.6)
Foreign currency translation:
Unrealized (loss) gain	(8.3)	(11.5)	(45.3)	116.4
Reclassification of gain into earnings	0.0	0.0	(0.2)	0.0
Derivative instruments:
Unrealized gain	1.7	1.9	5.4	7.4
Reclassification of gain into earnings	(1.7)	(2.0)	(5.4)	(7.6)
Defined benefit plans:
Unrealized (loss) gain	(0.8)	(0.4)	(2.7)	2.8
Reclassification of loss into earnings	0.0	0.0	0.0	(17.3)
Other comprehensive (loss) income before income taxes	(9.1)	(12.0)	(48.2)	136.3
Income tax effect	(12.2)	(1.2)	(11.4)	24.1
Other comprehensive (loss) income	(21.3)	(13.2)	(59.6)	160.4
Comprehensive income (loss)	$ 182.1	$ (725.0)	$ 225.2	$ (422.2)