Business Acquisitions and Dispositions (Details) $ in Millions									12 Months Ended
	Aug. 20, 2024 USD ($)	Feb. 26, 2024 USD ($)	Dec. 26, 2023 USD ($)	Aug. 21, 2023 USD ($)	Aug. 07, 2023 USD ($)	Aug. 04, 2023 USD ($)	May 02, 2023 USD ($)	Oct. 04, 2022 USD ($)	Dec. 31, 2024 USD ($) acquisition	Dec. 31, 2023 USD ($) acquisition	Dec. 31, 2022 USD ($) acquisition
Business Acquisition [Line Items]
Number of businesses acquired | acquisition									4	4	7
Goodwill									$ 19,312.9	$ 17,118.8	$ 15,946.1
Cash paid, net of cash acquired									3,612.9	2,052.7	4,280.1
Proceeds from sale of equity investment									$ 245.6	$ 0.0	$ 0.0
Certinia Inc.
Business Acquisition [Line Items]
Equity method investment, ownership percentage						18.20%
Cash paid, net of cash acquired						$ 125.0
Genesis Ultimate Holding Co.
Business Acquisition [Line Items]
Aggregate purchase price		$ 1,860.0
Federal tax attributes		$ 110.0
Tax benefit utilization period (in years)		13 years
Goodwill		$ 1,208.2
Other identifiable intangibles		762.0
Deferred tax liabilities		122.0
Genesis Ultimate Holding Co. | Trade names
Business Acquisition [Line Items]
Intangible assets acquired, not subject to amortization		39.0
Genesis Ultimate Holding Co. | Customer related intangibles
Business Acquisition [Line Items]
Other identifiable intangibles		$ 708.0
Weighted average useful life of finite-lived intangible assets (in years)		20 years
Genesis Ultimate Holding Co. | Technology
Business Acquisition [Line Items]
Other identifiable intangibles		$ 54.0
Weighted average useful life of finite-lived intangible assets (in years)		5 years
RCP Vega Holdings, LLC
Business Acquisition [Line Items]
Aggregate purchase price	$ 1,607.0
Federal tax attributes	$ 100.0
Tax benefit utilization period (in years)	14 years
Goodwill	$ 947.3
Other identifiable intangibles	705.0
Deferred tax liabilities	76.0
RCP Vega Holdings, LLC | Trade names
Business Acquisition [Line Items]
Intangible assets acquired, not subject to amortization	41.0
RCP Vega Holdings, LLC | Customer related intangibles
Business Acquisition [Line Items]
Other identifiable intangibles	$ 656.0
Weighted average useful life of finite-lived intangible assets (in years)	18 years
RCP Vega Holdings, LLC | Technology
Business Acquisition [Line Items]
Other identifiable intangibles	$ 49.0
Weighted average useful life of finite-lived intangible assets (in years)	6 years
Other acquisitions
Business Acquisition [Line Items]
Number of businesses acquired | acquisition									2	3	6
Aggregate purchase price									$ 153.1		$ 578.8
Goodwill									99.9	$ 330.6	361.5
Other identifiable intangibles									53.3	229.1	239.3
Other acquisitions | Trade names
Business Acquisition [Line Items]
Intangible assets acquired, not subject to amortization									3.2	15.4	9.5
Other acquisitions | Customer related intangibles
Business Acquisition [Line Items]
Other identifiable intangibles									$ 47.3	$ 209.4	$ 223.4
Weighted average useful life of finite-lived intangible assets (in years)									14 years 6 months	16 years 10 months 24 days	18 years 2 months 12 days
Other acquisitions | Technology
Business Acquisition [Line Items]
Other identifiable intangibles									$ 6.0	$ 19.7	$ 15.9
Weighted average useful life of finite-lived intangible assets (in years)									5 years	5 years	4 years 10 months 24 days
Syntellis Performance Solutions, LLC
Business Acquisition [Line Items]
Aggregate purchase price					$ 1,381.0
Federal tax attributes					135.0
Goodwill					859.0
Other identifiable intangibles					$ 594.0
Business combination, consideration tax benefit utilized over period					15 years
Syntellis Performance Solutions, LLC | Trade names
Business Acquisition [Line Items]
Intangible assets acquired, not subject to amortization					$ 17.0
Syntellis Performance Solutions, LLC | Customer related intangibles
Business Acquisition [Line Items]
Other identifiable intangibles					$ 529.0
Weighted average useful life of finite-lived intangible assets (in years)					20 years
Syntellis Performance Solutions, LLC | Technology
Business Acquisition [Line Items]
Other identifiable intangibles					$ 65.0
Weighted average useful life of finite-lived intangible assets (in years)					7 years
Promium, LLC
Business Acquisition [Line Items]
Aggregate purchase price							$ 16.5
Certinia Inc.
Business Acquisition [Line Items]
Proceeds from sale of equity investment									$ 245.6
Replicon Inc.
Business Acquisition [Line Items]
Aggregate purchase price				$ 447.5
Federal tax attributes				$ 80.0
Business combination, consideration tax benefit utilized over period				15 years
Executive Business Services, Inc. (“ProPricer”)
Business Acquisition [Line Items]
Aggregate purchase price			$ 79.5
Frontline Technologies Parent LLC
Business Acquisition [Line Items]
Aggregate purchase price								$ 3,738.0
Federal tax attributes								350.0		$ 500.0
Goodwill								2,197.6
Other identifiable intangibles								$ 1,918.6
Deferred tax liabilities										122.0
Enterprise value, adjusted for cash and the settlement of liabilities, net of tax benefit											$ 3,725.0
Business combination, consideration tax benefit utilized over period								15 years
Amortizable intangible assets								$ 1,835.6
Deferred tax assets (liabilities), net										258.0
Goodwill, expected tax deductible amount										$ 1,200.0
Frontline Technologies Parent LLC | Trade names
Business Acquisition [Line Items]
Intangible assets acquired, not subject to amortization								83.0
Frontline Technologies Parent LLC | Customer related intangibles
Business Acquisition [Line Items]
Other identifiable intangibles								$ 1,757.0
Weighted average useful life of finite-lived intangible assets (in years)								20 years
Frontline Technologies Parent LLC | Technology
Business Acquisition [Line Items]
Other identifiable intangibles								$ 78.6
Weighted average useful life of finite-lived intangible assets (in years)								5 years