Commitments and Contingencies (Environmental Accruals) (Details) - USD ($) $ in Millions	Dec. 31, 2016	Dec. 31, 2015
Commitments and Contingencies Disclosure [Abstract]
Accrued expenses	$ 1.2	$ 1.3
Other liabilities	4.4	4.0
Total environmental accruals	$ 5.6	$ 5.3