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Business Acquisitions (Details) - USD ($) $ in Millions			3 Months Ended
Business Acquisitions (Details) - USD ($) $ in Millions	Apr. 23, 2025	Feb. 19, 2025	Mar. 31, 2025	Dec. 31, 2024
Business Acquisition [Line Items]
Goodwill			$ 19,408.2	$ 19,312.9
MuniLink
Business Acquisition [Line Items]
Aggregate purchase price		$ 118.0
Federal tax attributes		$ 20.0
Goodwill			73.5
Other identifiable intangibles			45.6
MuniLink \| Customer related intangibles
Business Acquisition [Line Items]
Other identifiable intangibles			$ 41.8
Weighted average useful life of finite-lived intangible assets (in years)			17 years
MuniLink \| Technology
Business Acquisition [Line Items]
Other identifiable intangibles			$ 3.8
Weighted average useful life of finite-lived intangible assets (in years)			5 years
CentralReach \| Subsequent Event
Business Acquisition [Line Items]
Aggregate purchase price	$ 1,850.0
Federal tax attributes	$ 200.0