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Business Acquisitions and Disposition (Details) $ in Millions		6 Months Ended
	Mar. 17, 2021 USD ($)	Jun. 30, 2021 USD ($) acquisition	Dec. 31, 2020 USD ($)
Business Acquisition [Line Items]
Number of business acquisitions \| acquisition		2
Goodwill		$ 14,430.0	$ 14,395.2
Sedaru, Inc.
Business Acquisition [Line Items]
Sale of investment	$ 27.1
Pretax gain on sale of investment	$ 27.1
Other acquisitions
Business Acquisition [Line Items]
Number of business acquisitions \| acquisition		2
Purchase price		$ 15.7
Goodwill		10.7
Intangible assets acquired		6.7
Other acquisitions \| Customer related intangibles
Business Acquisition [Line Items]
Intangible assets acquired		$ 6.4
Weighted average useful life of intangible assets acquired		13 years 9 months 18 days
Other acquisitions \| Technology
Business Acquisition [Line Items]
Intangible assets acquired		$ 0.3
Weighted average useful life of intangible assets acquired		5 years