Business Combinations - Consideration Paid and Assets Acquired and Liabilities Assumed (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
Summary of the aggregate consideration paid and the aggregate amounts of the assets acquired and liabilities assumed
Accounts receivable	$ 6.9	$ 3.9
Inventory	130.3	45.2
Other current assets	2.5	0.1
Property and equipment	12.8	0.6
Indefinite-lived intangibles	362.1	24.8
Other non-current assets	0.1
Current liabilities	(23.8)	(9.2)
Non-current liabilities	(2.8)
Total consideration	488.1	65.4
Consideration transferred through common stock issuance	(32.4)
Contingent consideration	(20.0)
Seller financed/assumed debt	(3.8)
Total cash used in acquisitions	$ 431.9	$ 65.4