Condensed Consolidated Statements of Comprehensive Loss (Unaudited) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Statement of Comprehensive Income [Abstract]
Net loss	$ (42.9)	$ (19.0)
Other comprehensive income (loss), net of tax:
Foreign currency translation, net of tax	10.6	(15.7)
Unrealized losses on net investment hedges, net of tax	(2.3)	0.0
Other comprehensive income (loss), net of tax	8.3	(15.7)
Comprehensive loss	(34.6)	(34.7)
Less: Comprehensive loss attributable to noncontrolling interests	(0.7)	(2.8)
Comprehensive loss attributable to Mirion Technologies, Inc.	$ (33.9)	$ (31.9)