Basis of Presentation and Summary of Significant Accounting Policies - Customer Bankruptcy & Non-Monetary Transactions (Details) - USD ($) $ in Millions		1 Months Ended	3 Months Ended				9 Months Ended	12 Months Ended
	Jul. 01, 2017	Jan. 31, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Apr. 01, 2017	Sep. 30, 2017	Dec. 31, 2016
Concentration Risk [Line Items]
Release of product return and rebate reserves			$ 12.4
WynitDistribution [Member] | Customer Concentration Risk [Member]
Concentration Risk [Line Items]
Unrecognized revenue, net					$ 8.1
Allowance for Doubtful Accounts Receivable					35.8
Unrecoverable inventory					5.5
Accounts receivable for shipments made in the quarter					30.3		$ 30.3
Insurance proceeds receivable, accounts receivable					22.7		22.7
Probably insurance proceeds					26.8		26.8
Insurance proceeds receivable, inventory					4.1		4.1
Charges offset by insurance recorded							$ 9.0
Bad debt expense					7.6
Cost of revenue					$ 1.4
Proceeds from insurance settlement		$ 5.4		$ 21.4
WynitDistribution [Member] | Revenue [Member] | Customer Concentration Risk [Member]
Concentration Risk [Line Items]
Concentration risk, percentage	11.00%
WynitDistribution [Member] | Accounts Receivable [Member] | Customer Concentration Risk [Member]
Concentration Risk [Line Items]
Concentration risk, percentage	19.00%
Advertising Barter Transactions [Member]
Concentration Risk [Line Items]
Nonmonetary transaction, gross operating revenue recognized								$ 15.0
Nonmonetary transaction, cost of goods transferred								7.0
Nonmonetary transaction, advertising credit received								13.0
Nonmonetary transaction, cash received								2.0
Nonmonetary transaction, remaining advertising credit			$ 12.1	$ 12.2				$ 13.0
Nonmonetary transaction, advertising credit, expected period of use			4 years
Nonmonetary transaction, advertising credit utilized during the period			$ 0.1			$ 0.0