Note 10. Employee Retirement Plans Net Retirement Expense (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Retirement Benefits [Abstract]
Defined Benefit Plan, Service Cost	$ 0.1	$ 0.1	$ 0.2
Defined Benefit Plan, Interest Cost	19.7	18.3	19.6
Defined Benefit Plan, Expected Return (Loss) on Plan Assets	(23.0)	(27.4)	(27.2)
Defined Benefit Plan, Amortization of Gain (Loss)	4.6	4.8	4.9
Defined Benefit Plan, Other Cost (Credit)	0.0	0.6	0.0
Defined Benefit Plan, Net Periodic Benefit Cost (Credit)	1.4	(3.6)	(2.5)
Defined Contribution Plan, Cost	11.0	11.1	7.7
Pension Cost (Reversal of Cost)	$ 12.4	$ 7.5	$ 5.2