Acquisition and Discontinued Operations (Narrative) (Details) - USD ($) $ in Millions		1 Months Ended	3 Months Ended		9 Months Ended
	Jan. 13, 2017	Apr. 30, 2017	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016	Dec. 04, 2014
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Business acquisition, goodwill			$ 10.7		$ 10.7		$ 1.1
Income tax (benefit)			(5.9)	$ (14.7)	(5.4)	$ (16.6)
DLW [Member]
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Contingent liability								$ 12.9
Assets removed from balance sheet								151.9
Liabilities removed from balance sheet								$ 164.8
Settlement agreement and mutual release with administrator to settle all claims of Administrator related to insolvency for a cash payment		$ 11.8
DLW [Member] | Accounts Payable and Accrued Expenses [Member]
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Contingent liability							$ 11.9
DLW and AFI [Member]
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Income tax (benefit)			$ (5.9)	$ (14.7)	$ (5.4)	$ (16.6)
Tectum [Member]
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Business acquisition, purchase price	$ 31.4
Business acquisition, total fair value of tangible assets acquired, less liabilities assumed	5.9
Business acquisition, total fair value of intangible assets of amortizable customer relationships and non-amortizing brand names	16.0
Business acquisition, goodwill	$ 9.5