Consolidated Statements of Shareholders Equity Parentheticals (Parentheticals) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Dividends per share	$ 0.00	$ 0.00	$ 0.24
Purchases and sales of noncontrolling interests, net of dividends paid	$ 0.2	$ 1.8	$ 2.9