Income Taxes - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Income Tax Contingency [Line Items]
Net deferred tax assets	$ 67.4	$ 24.9
Increase in valuation allowance	18.5
Employee service share-based compensation, tax benefit from exercise of stock options	3.6	7.2	$ 6.7
Excess tax benefit from share-based compensation, operating activities	1.5	4.6	4.8
Net operating loss carryforwards	34.8
Operating loss carryforwards, valuation allowances	29.2
Gross unrecognized tax benefits	5.1	6.6	5.7	$ 7.1
Recognized potential interest and penalties	(0.4)	0.6	$ (0.1)
Unrecognized tax benefits that would impact effective tax rate	7.3
Estimated reduction in unrecognized tax benefits within twelve months	1.4
Continuing operations
Income Tax Contingency [Line Items]
Gross unrecognized tax benefits	5.1	6.6
Unrecognized tax benefits, net of offsetting indirect tax benefits	7.3	9.2
Potential interest and penalties	2.2	2.6
Danaher | United States
Income Tax Contingency [Line Items]
Net deferred tax assets	20.5
Net deferred tax liabilities		15.1
Danaher | Foreign tax
Income Tax Contingency [Line Items]
Net deferred tax assets	$ 46.9	$ 40.0