Discontinued Operations - Carrying Amounts of Assets and Liabilities of Discontinued Operations (Details) - USD ($) $ in Millions	Sep. 30, 2017	Dec. 31, 2016	Sep. 30, 2016
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Cash and cash equivalents	$ 0.0		$ 23.7
Current assets held for sale	16.8	$ 108.0
Noncurrent assets held for sale	2.5	55.4
Current liabilities held for sale	8.1	48.2
Noncurrent liabilities held for sale	0.3	20.9
Darex | Held-for-sale
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Cash and cash equivalents	0.0	16.3
Trade accounts receivable	7.9	50.5
Inventories	7.9	32.3
Other current assets	1.0	8.9
Current assets held for sale	16.8	108.0
Properties and equipment, net	1.9	39.6
Goodwill	0.0	4.4
Technology and other intangible assets, net	0.0	0.4
Deferred income taxes	0.0	6.4
Other assets	0.6	4.6
Noncurrent assets held for sale	2.5	55.4
Accounts payable	6.8	26.7
Other current liabilities	1.3	21.5
Current liabilities held for sale	8.1	48.2
Deferred income taxes	0.0	2.3
Underfunded and unfunded defined benefit pension plans	0.3	14.8
Other liabilities	0.0	3.8
Noncurrent liabilities held for sale	$ 0.3	$ 20.9