Note 1. Summary of Significant Accounting Policies Long-Lived Assets (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Jun. 30, 2020	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Restructuring Cost and Reserve [Line Items]
Impairment of long-lived assets	$ 369.4	$ 0.0	$ 0.0	$ 396.4
Railroad Transportation Equipment [Member]
Restructuring Cost and Reserve [Line Items]
Impairment of long-lived assets				369.4
Building [Member]
Restructuring Cost and Reserve [Line Items]
Impairment of long-lived assets				15.2
Investments [Domain]
Restructuring Cost and Reserve [Line Items]
Impairment of long-lived assets				$ 11.8