Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ 29.8	$ (36.6)	$ (98.7)
Foreign currency translation gain (loss), net of tax	68.5	(41.2)	18.8
Unrecognized actuarial gain (loss) and prior service benefit, net of tax	0.1	0.4	(0.1)
Unrealized (loss) gain on net investment hedges, net of tax	(26.6)	12.1	(8.0)
Unrealized (loss) gain on cash flow hedges, net of tax	(0.3)	0.1	0.1
Other comprehensive income (loss), net of tax	41.7	(28.6)	10.8
Comprehensive income (loss)	71.5	(65.2)	(87.9)
Less: Comprehensive income (loss) attributable to noncontrolling interests	2.3	(1.4)	(1.4)
Comprehensive income (loss) attributable to Mirion Technologies, Inc.	$ 69.2	$ (63.8)	$ (86.5)