Acquisitions - Narrative (Details) $ in Millions				12 Months Ended
	Dec. 27, 2021 USD ($)	Aug. 24, 2021 USD ($)	Apr. 01, 2019 USD ($) country	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)
Business Acquisition [Line Items]
Goodwill				$ 9,152.0	$ 7,359.2	$ 7,241.5
Gain on litigation resolution				29.9	0.0	0.0
Provation
Business Acquisition [Line Items]
Total purchase price	$ 1,400.0
Goodwill				969.6
Revenue of prior fiscal year					90.0
ServiceChannel
Business Acquisition [Line Items]
Total purchase price		$ 1,200.0
Goodwill				873.4
Revenue of prior fiscal year					70.0
Deferred compensation consideration		$ 28.0
Revenue from acquiree since acquisition date				46.4
Operating loss of acquiree since acquisition date				60.9
Amortization of intangibles and integration and transaction costs attributable to acquiree				12.0
Pretax transaction and integration related costs related costs				47.9
ASP
Business Acquisition [Line Items]
Total purchase price			$ 2,700.0
Goodwill				1,450.2
Revenue of prior fiscal year							$ 800.0
Pretax transaction and integration related costs related costs				11.0	$ 70.0	86.0
Litigation liability assumed				26.0
Gain on litigation resolution				26.0
Number of principal countries | country			20
Number of non-principal countries | country			39
Post-close transaction and integration costs						230.0
Other
Business Acquisition [Line Items]
Total purchase price						1,200.0
Goodwill						781.0
Revenue of prior fiscal year							$ 191.0
Revenue from acquiree since acquisition date						76.0
Operating loss of acquiree since acquisition date						53.0
Pretax transaction and integration related costs related costs						17.0
Gain on litigation resolution				$ 3.9
Tax deductible goodwill						$ 21.0