Restructuring and Other Expense - Components of Restructuring and Other Expense (Details) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
		Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Restructuring and Related Activities [Abstract]
Severance and related		$ 0.1	$ 0.4	$ 1.0	$ 0.4
Loss on abandonment of unused property, plant and equipment		1.1	0.0	1.1	0.0
Other	[1]	(0.8)	0.0	(1.7)	0.0
Total Restructuring		0.4	0.4	0.4	0.4
Pension settlement/curtailment (Note 9)		0.8	0.3	0.8	2.6
Asset disposals / write down		0.0	0.0	0.0	0.1
Other	[2]	0.0	0.6	(0.1)	4.0
Total Other		0.8	0.9	0.7	6.7
Total Restructuring and Other		1.2	1.3	1.1	7.1
Restructuring Cost and Reserve [Line Items]
Earnest money payment relating to asset sale		0.8		1.0
Other consulting fees			0.1
Property tax refund					(1.9)
Other	[2]	0.0	0.6	(0.1)	4.0
Affiliated Entity | Realization Services, Inc. | Consulting Expenses with Realization Services
Restructuring Cost and Reserve [Line Items]
Consulting expenses with related party		$ 0.6	0.3	0.6	2.4
Affiliated Entity | Otterbourg P.C. | Consulting Expenses with Realization Services
Restructuring Cost and Reserve [Line Items]
Consulting expenses with related party			$ 0.2		1.4
Contingent Consideration Obligations | CDI
Restructuring Cost and Reserve [Line Items]
Reversal of cost				0.3
Other Employee Costs
Restructuring and Related Activities [Abstract]
Other					2.1
Restructuring Cost and Reserve [Line Items]
Reversal of cost				$ 0.4
Other					$ 2.1

[1] For the three months ended September 30, 2017, other includes $0.8 million net gain from an asset sale. For the nine months ended September 30, 2017, other includes $1.0 million net gain from an asset sale, $0.3 million reversal of contingent consideration obligations related to the CDI acquisition (see Note 15 - Litigation, Commitments and Contingencies for additional information), and $0.4 million reversal of other employee costs. We have considered these costs to be attributable to our corporate activities and, therefore, they are not part of our discontinued operations.

[2] For the three months ended September 30, 2016, other includes consulting expenses of $0.3 million and $0.2 million for Realization Services, Inc. (See Note 16 - Related Party Transactions for additional information) and Otterbourg P.C., respectively and $0.1 million for other consulting fees. For the nine months ended September 30, 2016, other includes consulting expenses of $2.4 million and $1.4 million for Realization Services, Inc. and Otterbourg P.C., respectively, a net credit of $1.9 million for property tax refund for the former Oakdale site, as well as $2.1 million for other employee costs and consulting fees directly attributable to our Restructuring Plan. We have considered these costs to be attributable to our corporate activities and, therefore, they are not part of our discontinued operations.