Note 7. Income Taxes (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Income Tax Disclosure [Abstract]
Effective income tax rate	41.10%	42.80%	40.20%	34.20%
Discrete tax benefits (charges)	$ (0.7)	$ (1.0)	$ (0.1)	$ 6.2