Condensed Consolidated Statements of Comprehensive Loss - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Statement of Comprehensive Income [Abstract]
Net loss	$ (12.0)	$ (28.4)	$ (38.5)	$ (71.3)
Other comprehensive (loss) income, net of tax:
Foreign currency translation (loss) gain, net of tax	(7.1)	0.6	(21.8)	11.2
Unrealized gain (loss) on net investment hedges, net of tax	1.5	(2.1)	6.4	(4.3)
Unrealized gain (loss) on cash flow hedge, net of tax	0.1	0.9	0.7	0.9
Other comprehensive (loss) income, net of tax	(5.5)	(0.6)	(14.7)	7.8
Comprehensive loss	(17.5)	(29.0)	(53.2)	(63.5)
Less: Comprehensive loss attributable to noncontrolling interest	(0.5)	(0.8)	(1.5)	(1.4)
Comprehensive loss attributable to Mirion Technologies, Inc.	$ (17.0)	$ (28.2)	$ (51.7)	$ (62.1)