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Condensed Consolidated Statements of Comprehensive Income (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 $ 7.8 $ 3.1 $ 12.5 $ 12.0
Other comprehensive (loss) income, net of tax:        
Foreign currency translation (loss) gain, net of tax (0.5) (1.2) (20.0) 65.1
Unrealized gain (loss) on net investment hedges, net of tax 2.1 0.5 7.9 (27.9)
Unrealized (loss) gain on cash flow hedges, net of tax 0.0 (0.1) 0.3 (0.2)
Other comprehensive income (loss), net of tax 1.6 (0.8) (11.8) 37.0
Comprehensive income 9.4 2.3 0.7 49.0
Less: Comprehensive income (loss) attributable to noncontrolling interest 0.5 (0.2) 0.6 1.2
Comprehensive income attributable to Mirion Technologies, Inc. stockholders $ 8.9 $ 2.5 $ 0.1 $ 47.8