Business Investments and Acquisitions - Purchase Price Allocation (Details) - USD ($) $ in Millions	Sep. 30, 2020	Dec. 31, 2019	Sep. 30, 2019
Business Acquisition [Line Items]
Goodwill	$ 801.2	$ 800.9
Acquisitions
Business Acquisition [Line Items]
Current assets acquired net of liabilities assumed			$ 12.2
Property, plant and equipment			2.1
Identifiable intangible assets			36.4
Other non-current assets (liabilities), net			0.3
Deferred tax liabilities			(3.5)
Goodwill			19.3
Total			$ 66.8