Note 9. Income Taxes Deferred Tax Liabilities (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Income Tax Disclosure [Abstract]
Deferred Tax Liabilities, Property, Plant and Equipment	$ 1,032.2	$ 996.8
Deferred Tax Liabilities, Partially Owned Subsidiaries	139.2	139.9
Deferred Tax Liabilities, Right-of-use Assets	18.7	17.5
Deferred Tax Liabilities, Deferred Expense, Reserves and Accruals	1.9	0.0
Deferred Tax Liabilities, Gross	1,192.0	1,154.2
Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits	28.7	27.1
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Warranty Reserves	7.3	3.9
Deferred Tax Assets, Other	5.9	9.5
Deferred Tax Assets, Tax Credit Carryforwards	38.4	62.8
Deferred Tax Assets, Inventory	6.0	5.4
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Accrued Liabilities	0.0	5.3
Deferred Tax Assets, Lease Liabilities	24.4	22.9
Deferred Tax Assets, Gross	110.7	136.9
Deferred Tax Liabilities, Net, Before Adjustments	1,081.3	1,017.3
Deferred Tax Assets, Valuation Allowance	24.4	25.2
Deferred Tax Liabilities, Net, Before Uncertain Tax Positions	1,105.7	1,042.5
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Other	(1.1)	(1.0)
Deferred Tax Liabilities, Net	1,104.6	$ 1,041.5
Deferred Tax Assets, Operating Loss Carryforwards, Domestic	3.9
Deferred Tax Assets, Operating Loss Carryforwards, State and Local	$ 20.6