Schedule I - Condensed Financial Information of the Registrant - CONDENSED BALANCE SHEET (Details) - USD ($)	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Assets:
Total Assets	$ 2,636,000,000	$ 2,718,500,000
Liabilities and Stockholders’ Equity:
Accrued expenses and other current liabilities	102,700,000	95,600,000
Warrant liabilities	0	55,300,000
Total liabilities	1,076,900,000	1,168,500,000
Treasury Stock	(3,200,000)	(1,300,000)
Additional paid-in capital	2,143,300,000	2,056,500,000
Accumulated deficit	(541,500,000)	(505,400,000)
Accumulated Other Comprehensive Loss	(93,000,000.0)	(65,300,000)
Mirion Technologies, Inc. stockholders’ equity	1,505,600,000	1,484,500,000
Noncontrolling interests	53,500,000	65,500,000
Total Stockholders’ Equity	1,559,100,000	1,550,000,000	$ 1,467,200,000	$ 1,784,000,000
Total Liabilities and Stockholders’ Equity	2,636,000,000	2,718,500,000
Parent Company
Assets:
Investments in Sub	1,558,800,000	1,604,400,000
Total Assets	1,558,800,000	1,604,400,000
Liabilities and Stockholders’ Equity:
Accrued expenses and other current liabilities	200,000	0
Warrant liabilities	0	55,300,000
Deferred income taxes and other liabilities	(500,000)	(900,000)
Total liabilities	(300,000)	54,400,000
Treasury Stock	(3,200,000)	(1,300,000)
Additional paid-in capital	2,143,300,000	2,056,500,000
Accumulated deficit	(541,500,000)	(505,400,000)
Accumulated Other Comprehensive Loss	(93,000,000.0)	(65,300,000)
Mirion Technologies, Inc. stockholders’ equity	1,505,600,000	1,484,500,000
Noncontrolling interests	53,500,000	65,500,000
Total Stockholders’ Equity	1,559,100,000	1,550,000,000
Total Liabilities and Stockholders’ Equity	$ 1,558,800,000	$ 1,604,400,000