Acquisitions - Purchase Price Allocation (Details) - USD ($) $ in Millions	12 Months Ended
	Jun. 01, 2018	Jun. 30, 2018	Dec. 31, 2017	Jun. 01, 2017
Business Acquisition [Line Items]
Goodwill		$ 1,241.6	$ 1,271.2
Industrial Wood Acquisition [Member]
Business Acquisition [Line Items]
Accounts and notes receivable—trade	$ 23.3
Inventories	24.7
Prepaid expenses and other	0.2
Property, plant and equipment	23.1
Identifiable intangibles	259.1
Accounts payable	(22.2)
Other accrued liabilities	(4.7)
Net assets acquired before goodwill on acquisition	303.5
Goodwill	126.8
Net assets acquired	430.3
Measurement Period Adjustments
Accounts and notes receivable—trade	0.0
Inventories	(0.2)
Prepaid expenses and other	0.0
Property, plant and equipment	0.1
Identifiable intangibles	4.9
Accounts payable	0.2
Other accrued liabilities	0.4
Net assets acquired before goodwill on acquisition	5.4
Goodwill on acquisition	(5.8)
Net assets acquired	$ (0.4)
Scenario, Previously Reported [Member] | Industrial Wood Acquisition [Member]
Business Acquisition [Line Items]
Accounts and notes receivable—trade				$ 23.3
Inventories				24.9
Prepaid expenses and other				0.2
Property, plant and equipment				23.0
Identifiable intangibles				254.2
Accounts payable				(22.4)
Other accrued liabilities				(5.1)
Net assets acquired before goodwill on acquisition				298.1
Goodwill				132.6
Net assets acquired				$ 430.7