Business Combinations - Consideration Paid and Assets Acquired and Liabilities Assumed (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Summary of the aggregate consideration paid and the aggregate amounts of the assets acquired and liabilities assumed
Accounts receivable	$ 3.6	$ 6.9
Inventories	62.8	130.3
Other current assets		2.5
Property and equipment	52.6	12.8
Indefinite-lived intangibles	73.9	362.1
Other noncurrent assets		0.1
Current liabilities	(16.9)	(23.8)
Noncurrent liabilities	(0.6)	(2.8)
Total consideration	175.4	488.1
Deferred consideration	(6.8)
Consideration transferred through common stock issuance		(32.4)
Contingent consideration		(20.0)
Seller financed/assumed debt		(3.8)
Total cash used in acquisitions	$ 168.6	$ 431.9