Other Balance Sheet Accounts (Details) - USD ($) $ in Millions	Jun. 30, 2016	Dec. 31, 2015
Other Current Liabilities
Accrued compensation	$ 37.2	$ 53.5
Income taxes payable	31.4	25.8
Deferred revenue	26.6	24.7
Environmental contingencies	25.2	21.4
Accrued interest	16.2	18.9
Pension liabilities	14.2	14.2
Other accrued liabilities	60.3	75.9
Total Other Current Liabilities	$ 211.1	$ 234.4