Acquisitions - Summary of Allocation of Purchase Price for Acquisitions of Acquiree (Detail) - USD ($) $ in Millions	Jun. 30, 2022	Mar. 31, 2022	Mar. 25, 2022	Mar. 16, 2022	Dec. 31, 2021
Business Acquisition [Line Items]
Goodwill	$ 8,866.8	$ 8,866.8			$ 8,045.5
Hubwise Holdings Limited [Member]
Business Acquisition [Line Items]
Accounts receivable			$ 0.7
Property, plant and equipment			0.1
Other assets			0.3
Operating lease right-of-use assets			0.3
Goodwill			50.5
Accounts payable			(0.2)
Accrued employee compensation and benefits			0.0
Deferred revenue			0.0
Deferred income taxes			(8.2)
Other liabilities assumed			(0.7)
Consideration paid, net of cash acquired			75.5
Hubwise Holdings Limited [Member] | Acquired Client Relationships and Contracts
Business Acquisition [Line Items]
Intangible assets acquired			23.0
Hubwise Holdings Limited [Member] | Completed technologies
Business Acquisition [Line Items]
Intangible assets acquired			8.7
Hubwise Holdings Limited [Member] | Trade names
Business Acquisition [Line Items]
Intangible assets acquired			$ 1.0
Blue Prism [Member]
Business Acquisition [Line Items]
Accounts receivable				$ 50.1
Property, plant and equipment				1.9
Other assets				10.4
Operating lease right-of-use assets				4.4
Goodwill				945.3
Accounts payable				(6.6)
Accrued employee compensation and benefits				(23.2)
Deferred revenue				(166.9)
Deferred income taxes				(110.7)
Other liabilities assumed				(35.2)
Consideration paid, net of cash acquired				1,477.5
Blue Prism [Member] | Acquired Client Relationships and Contracts
Business Acquisition [Line Items]
Intangible assets acquired				520.0
Blue Prism [Member] | Completed technologies
Business Acquisition [Line Items]
Intangible assets acquired				250.0
Blue Prism [Member] | Trade names
Business Acquisition [Line Items]
Intangible assets acquired				$ 38.0