Business Acquisitions and Dispositions - Summary of the Preliminary Fair Values of Assets Acquired and Liabilities Assumed (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Business Acquisition [Line Items]
Goodwill	$ 1,811.8	$ 1,784.4	$ 1,089.0
2019 Acquisitions
Business Acquisition [Line Items]
Tangible assets acquired	21.7
Intangible assets	33.2
Goodwill	29.4
Net deferred taxes	(5.7)
Other liabilities assumed	(9.3)
Total Estimate of Consideration Transferred, Net of Cash Acquired	$ 69.3