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Business Combinations - Net Asset Acquired (Details) - USD ($) $ in Millions	6 Months Ended	9 Months Ended
	Jun. 30, 2020	Sep. 30, 2020	Dec. 31, 2019	Jul. 01, 2019
Net assets acquired:
Goodwill		$ 817.6	$ 811.4
Adjustments
Goodwill		$ 0.4
AXC
Net assets acquired:
Identifiable intangible assets	$ 256.4		256.4	$ 256.4
Goodwill	287.9		287.5
Property, plant and equipment	34.2		34.2
Other assets	53.1		53.1
Liabilities	(31.9)		(31.5)
Net assets acquired	599.7		$ 599.7
Adjustments
Goodwill	0.4
Liabilities	(0.4)
Net assets acquired	$ 0.0

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