Note 8. Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Income Tax Disclosure [Abstract]
Effective income tax rate	38.40%	40.90%	39.00%	39.50%
Discrete tax benefits (charges)	$ 0.8	$ (0.7)	$ 0.7	$ 0.6