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Business Combinations - Net Asset Acquired (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2020	Dec. 31, 2019	Jul. 01, 2019
Net assets acquired:
Goodwill	$ 844.2	$ 844.9
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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Amount of intangible assets, excluding goodwill, acquired at the acquisition date.

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