Income Tax Matters Income Tax Matters Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Tax Disclosure [Abstract]
Operating Loss Carryforwards	$ 564.4
Excess Tax Benefit From Employee Restricted Stock Resulting In Net Operating Loss Carry forwards	1.7
Tax Credit Carryforward, Amount	29.5
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount	2.0	$ (0.7)	$ 1.2
Unrecognized Tax Benefits	1.7	2.2	3.8	$ 15.7
Unrecognized Tax Benefits that Would Impact Effective Tax Rate	0.6	1.1	2.7
Accrued interest and penalties on unrecognized tax benefits	0.2	1.4
Accrued interest and penalties on unrecognized tax benefits, current	0.0	0.0
(Decrease) increase in interest and penalty	(1.2)	(0.9)	(5.2)
Foreign currency impact on gross unrecognized tax benefit (including interest and penalties) which increased (decreased) Other comprehensive income (loss)	$ 0.1	$ 0.3	$ 0.7