Other Balance Sheet Accounts (Details) - USD ($) $ in Millions	Sep. 30, 2017	Dec. 31, 2016
Other Current Liabilities
Accrued compensation	$ 49.7	$ 49.6
Environmental contingencies	24.5	32.5
Deferred revenue	16.4	27.2
Income taxes payable	29.9	16.2
Pension liabilities included in other current liabilities	15.3	14.4
Income taxes payable	14.9	5.7
Other accrued liabilities	57.2	63.3
Total Other Current Liabilities	207.9	208.9
Other Liabilities, Noncurrent [Abstract]
Environmental contingencies	46.1	33.8
Liability to unconsolidated affiliate	28.0	27.0
Fair value of currency and interest rate contracts	20.1	3.2
Asset Retirement Obligation	8.5	10.2
Postemployment liability	6.9	7.2
Deferred revenue	9.5	2.3
Other noncurrent liabilities	46.2	43.0
Other Liabilities, Noncurrent	$ 165.3	$ 126.7