Income Taxes - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income Tax Contingency [Line Items]
Net deferred tax liabilities	$ 74.7	$ 112.9
Decrease in valuation allowance	(36.0)
Impact of step up assets	$ (42.8)
Effective tax rate	(3.50%)	312.50%	21.20%
Employee service share-based compensation, tax benefit from exercise of stock options	$ 6.7	$ 4.2	$ 8.4
Excess tax benefit from share-based compensation, operating activities	4.8	2.3	6.2
Net operating loss carryforwards	114.1
Operating loss carryforwards, valuation allowances	78.3
Gross unrecognized tax benefits	5.7	7.1	9.1	$ 27.2
Recognized potential interest and penalties	(0.1)	0.0	$ 0.6
Unrecognized tax benefits that would impact effective tax rate	7.6
Estimated reduction in unrecognized tax benefits within twelve months	1.6
Danaher | United States
Income Tax Contingency [Line Items]
Net deferred tax liabilities	133.0	117.6
Danaher | Foreign tax
Income Tax Contingency [Line Items]
Net deferred tax liabilities	58.5
Net deferred tax assets		4.5
Continuing operations
Income Tax Contingency [Line Items]
Gross unrecognized tax benefits	5.7	7.1
Unrecognized tax benefits, net of offsetting indirect tax benefits	7.6	9.0
Potential interest and penalties	$ 1.9	$ 1.9