Note 10. Income Taxes Deferred Tax Liabilities (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Income Tax Disclosure [Abstract]
Deferred Tax Liabilities, Property, Plant and Equipment	$ 1,100.6	$ 1,072.6
Deferred Tax Liabilities, Partially Owned Subsidiaries	129.9	134.3
Deferred Tax Liabilities, Right-of-use Assets	22.3	20.9
Deferred Tax Liabilities, Equity items	3.5	4.8
Deferred Tax Liabilities, Deferred Expense, Reserves and Accruals	4.8	3.0
Deferred Tax Liabilities, Gross	1,261.1	1,235.6
Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits	30.0	27.4
Deferred tax asset, Interest expense	85.0	31.3
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Warranty Reserves	1.5	2.8
Deferred Tax Assets, Tax Credit Carryforwards	31.2	40.4
Deferred Tax Assets, Inventory	5.9	3.6
Deferred Tax Assets, Lease Liabilities	26.4	25.8
Deferred Tax Assets, Gross	180.0	131.3
Deferred Tax Liabilities, Net, Before Adjustments	1,081.1	1,104.3
Deferred Tax Assets, Valuation Allowance	21.6	29.5
Deferred Tax Liabilities, Net, Before Uncertain Tax Positions	1,102.7	1,133.8
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Other	(0.7)	(0.7)
Deferred Tax Liabilities, Net	1,102.0	$ 1,133.1
Deferred Tax Assets, Operating Loss Carryforwards, State and Local	20.0
Tax Credit Carryforward, Amount	$ 11.2