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Acquisitions - Narrative (Details) $ in Millions												3 Months Ended		9 Months Ended		12 Months Ended
Acquisitions - Narrative (Details) $ in Millions	Jun. 03, 2024 USD ($)	Jun. 01, 2024 USD ($)	May 31, 2024 USD ($)	May 01, 2024 USD ($)	Apr. 02, 2024 USD ($)	Apr. 01, 2024 USD ($)	Feb. 01, 2024 USD ($)	Aug. 18, 2023 USD ($)	Apr. 01, 2023 USD ($)	Feb. 01, 2023 USD ($)	Jan. 03, 2023 USD ($)	Sep. 30, 2024 USD ($)	Sep. 30, 2023 USD ($)	Sep. 30, 2024 USD ($)	Sep. 30, 2023 USD ($)	Dec. 31, 2023 USD ($) business
Business Acquisition [Line Items]
Goodwill												$ 8,206.2		$ 8,206.2		$ 6,609.7
Friulair
Business Acquisition [Line Items]
Cash consideration for acquisition							$ 143.3
Contingent consideration							11.0
Expected tax deductible amount of goodwill acquired							$ 0.0
Goodwill												68.6		68.6
Fluidics
Business Acquisition [Line Items]
Cash consideration for acquisition						$ 49.9
Contingent consideration						$ 2.0
Ethafilter s.r.l.
Business Acquisition [Line Items]
Cash consideration for acquisition					$ 15.6
Air Systems, LLC
Business Acquisition [Line Items]
Cash consideration for acquisition				$ 34.9
CAPS
Business Acquisition [Line Items]
Cash consideration for acquisition			$ 99.4
Fruitland
Business Acquisition [Line Items]
Cash consideration for acquisition			$ 28.3
Del Pumps
Business Acquisition [Line Items]
Cash consideration for acquisition		$ 25.2
ILC Dover
Business Acquisition [Line Items]
Cash consideration for acquisition	$ 2,349.7
Contingent consideration	75.0
Expected tax deductible amount of goodwill acquired	0.0
Goodwill	1,310.1											1,310.1		1,310.1
ILC Dover \| Customer relationships
Business Acquisition [Line Items]
Business combination, recognized identifiable assets acquired and liabilities assumed, finite-lived intangibles	$ 622.5
Acquired finite-lived intangible assets, weighted average useful life	14 years
ILC Dover \| Technology
Business Acquisition [Line Items]
Business combination, recognized identifiable assets acquired and liabilities assumed, finite-lived intangibles	$ 142.0
Acquired finite-lived intangible assets, weighted average useful life	8 years
ILC Dover \| Tradenames
Business Acquisition [Line Items]
Business combination, recognized identifiable assets acquired and liabilities assumed, indefinite-lived intangibles	$ 207.5
All Others
Business Acquisition [Line Items]
Goodwill												197.3		197.3		126.7
Purchase consideration														14.0		$ 84.0
Number of businesses acquired \| business																10
Acquisitions In 2024
Business Acquisition [Line Items]
Goodwill												1,576.0		1,576.0
Revenue from acquisition date												131.3		207.1
Net income (loss) from acquisition date												0.1		6.7
Air Treatment
Business Acquisition [Line Items]
Cash consideration for acquisition											$ 519.0
Expected tax deductible amount of goodwill acquired												0.0		0.0
Goodwill																$ 279.9
Paragon Tank Truck Equipment
Business Acquisition [Line Items]
Cash consideration for acquisition										$ 42.2
EcoPlant Technological Innovation Ltd
Business Acquisition [Line Items]
Cash consideration for acquisition									$ 29.5
Contingent consideration									$ 17.0
Roots
Business Acquisition [Line Items]
Cash consideration for acquisition								$ 290.0
Goodwill																105.6
Acquisitions In 2023
Business Acquisition [Line Items]
Goodwill																$ 512.2
Revenue from acquisition date												102.2	$ 83.1	308.3	$ 192.1
Net income (loss) from acquisition date												$ 15.6	$ 2.1	$ 43.8	$ 9.0