Note 10. Income Taxes Components of Income Tax Expense / Benefit (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Income Tax Disclosure [Abstract]
Current Federal Tax Expense (Benefit), CARES Act	$ 0.0	$ (0.5)	$ 2.1
Current Federal Tax Expense (Benefit), Other	38.7	2.1	(3.0)
Current Federal Tax Expense (Benefit)	38.7	1.6	(0.9)
Current State and Local Tax Expense (Benefit)	1.3	3.5	(0.6)
Current Foreign Tax Expense (Benefit)	10.5	7.8	4.3
Current Income Tax Expense (Benefit)	50.5	12.9	2.8
Deferred Tax Expense (Benefit), CARES Act	0.0	0.0	0.4
Deferred Other Tax Expense (Benefit)	(20.7)	14.5	10.4
Deferred Federal Income Tax Expense (Benefit)	(20.7)	14.5	10.8
Deferred State and Local Income Tax Expense (Benefit)	(8.1)	0.4	2.4
Deferred Foreign Income Tax Expense (Benefit)	(12.7)	(0.2)	(0.1)
Provision (benefit) for deferred income taxes	(41.5)	14.7	13.1
Provision (benefit) for income taxes:	$ 9.0	$ 27.6	$ 15.9