Consolidated Statements of Comprehensive Loss - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Statement of Comprehensive Income [Abstract]
Net loss	$ (36.6)	$ (98.7)	$ (288.4)
Foreign currency translation (loss) gain, net of tax	(41.2)	18.8	(50.3)
Unrecognized actuarial gain (loss) and prior service benefit, net of tax	0.4	(0.1)	2.0
Unrealized gains (losses) on net investment hedges, net of tax	12.1	(8.0)	(10.0)
Unrealized gain on cash flow hedge, net of tax	0.1	0.1	0.0
Other comprehensive income (loss), net of tax	(28.6)	10.8	(58.3)
Comprehensive loss	(65.2)	(87.9)	(346.7)
Less: Comprehensive loss attributable to noncontrolling interests	(1.4)	(1.4)	(14.8)
Comprehensive loss attributable to Mirion Technologies, Inc. stockholders	$ (63.8)	$ (86.5)	$ (331.9)