Note 9. Income Taxes Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent		21.00%	21.00%	35.00%
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Amount			$ 5.9	$ 476.2
Non-recurring Tax Charge	$ (9.7)
Income (Loss) from Continuing Operations before Income Taxes, Domestic		$ 201.1	139.8	186.2
Income (Loss) from Continuing Operations before Income Taxes, Foreign		$ (0.4)	$ 11.8	$ 9.2