Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Millions	Mar. 31, 2016	Dec. 31, 2015
Statement of Financial Position [Abstract]
Intangible assets, accumulated amortization	$ 2.9	$ 15.9
Intangible liabilities, accumulated amortization	$ 10.0	$ 9.8
Common stock, par value (in USD per share)	$ 0.01	$ 2.50
Common stock, shares authorized	30,000,000	30,000,000
Common stock, shares issued	18,402,961	18,162,148
Common stock, shares outstanding	18,402,961	18,162,148