Investments in and Advances to Affiliates Ownership percentages (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Cash Dividends Paid to Parent Company by Unconsolidated Subsidiaries	$ 3.0
Noncontrolling Interest, Ownership Percentage by Parent	50.00%
Gain on sale of joint venture	$ 0.0	$ 0.0	$ 1.2