Other Balance Sheet Accounts - Other Current Liabilities (Details) - USD ($) $ in Millions	Sep. 30, 2019	Dec. 31, 2018
Other Current Liabilities:
Accrued customer volume rebates	$ 26.7	$ 35.3
Accrued compensation	13.2	16.4
Income taxes payable	14.5	17.2
Accrued interest	9.1	4.0
Pension liabilities	1.3	1.3
Restructuring liability	4.8	10.2
Other accrued liabilities	45.8	61.1
Total other current liabilities	115.4	145.5
Other current liabilities | Darex | Disposed of by Sale
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Disposal group, deferred consideration	$ 0.5	$ 13.6