Other Balance Sheet Accounts (Details) - USD ($) $ in Millions	Jun. 30, 2015	Dec. 31, 2014
Other Current Liabilities
Accrued compensation	$ 73.2	$ 77.0
Income tax payable	43.5	34.1
Customer volume rebates	31.1	37.8
Environmental contingencies	19.7	21.5
Accrued interest	18.9	21.0
Deferred revenue	18.9	19.4
Pension liabilities	15.1	15.6
Deferred tax liability	1.6	1.5
Other accrued liabilities	117.0	112.1
Total Other Current Liabilities	$ 339.0	$ 340.0