Income Tax Matters, Reconciliation of Changes in the Gross Unrecognized Tax Benefits Table (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Reconciliation of changes in the gross unrecognized tax benefits:
Gross unrecognized tax benefits at beginning of period	$ 1.7	$ 2.2	$ 3.8
Gross increases for tax positions of prior years	0.1	0.1	0.0
Gross decrease for tax positions relating to lapse of a statute of limitation	0.0	(0.6)	(1.4)
Foreign currency translation	0.0	0.0	(0.2)
Gross unrecognized tax benefits at end of period	$ 1.8	$ 1.7	$ 2.2