Note 1. Summary of Significant Accounting Policies Long-Lived Assets (Details) - USD ($)	3 Months Ended					12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	[1]	Mar. 31, 2020	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Restructuring Cost and Reserve [Line Items]
Impairment of long-lived assets	$ 27,000,000.0	$ 0	$ 369,400,000		$ 0	$ 0	$ 396,400,000	$ 0
Other Assets [Member]
Restructuring Cost and Reserve [Line Items]
Assets Held-for-sale, Not Part of Disposal Group	$ 32,900,000					$ 6,200,000	32,900,000
Railroad Transportation Equipment [Member]
Restructuring Cost and Reserve [Line Items]
Impairment of long-lived assets							369,400,000
Building [Member]
Restructuring Cost and Reserve [Line Items]
Impairment of long-lived assets							15,200,000
Investments [Domain]
Restructuring Cost and Reserve [Line Items]
Impairment of long-lived assets							$ 11,800,000

[1] Impairment of long-lived assets during the three months ended June 30, 2020 relates to our small cube covered hopper railcars. See Note 11 for further information.