Note 1. Summary of Significant Accounting Policies Lessee Accounting (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Lessee, Lease, Description [Line Items]
Lessee, Operating Lease, Renewal Term		5 years
Lessee, Operating Lease, Option to Terminate		one year
Finance Lease, Principal Payments		$ 0.0
Operating lease expense		18.2	$ 15.2	$ 15.1
Short-term lease expense		0.4	0.2	2.1
Operating Lease, Payments		18.2	15.2	15.1
Right-of-use assets recognized in exchange for new lease liabilities (1)		28.8	23.0	$ 54.5	[1]
Right-of-use assets (2)	[2]	$ 93.1	$ 82.8
Lease liabilities (3)	[3]	Other liabilities	Other liabilities
Weighted average remaining lease term		9 years 10 months 24 days	10 years 9 months 18 days
Weighted average discount rate		2.80%	3.00%
2023		$ 20.9
2024		15.8
2025		13.0
2026		12.3
2027		11.8
Thereafter		59.9
Lessee, Operating Lease, Liability, to be Paid		133.7
Less: Present value adjustment		$ (18.9)
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration]		Other assets	Other assets
Minimum [Member]
Lessee, Lease, Description [Line Items]
Lessee, Operating Lease, Term of Contract		1 year
Maximum [Member]
Lessee, Lease, Description [Line Items]
Lessee, Operating Lease, Term of Contract		14 years
Railcar Leasing and Management Services Group [Member]
Lessee, Lease, Description [Line Items]
2023		$ 12.0
2024		8.1
2025		6.0
2026		5.7
2027		5.3
Thereafter		3.5
Lessee, Operating Lease, Liability, to be Paid		40.6
Consolidated Subsidiaries, Excluding Leasing [Member]
Lessee, Lease, Description [Line Items]
2023		8.9
2024		7.7
2025		7.0
2026		6.6
2027		6.5
Thereafter		56.4
Lessee, Operating Lease, Liability, to be Paid		$ 93.1

[1] Includes the commencement of the new headquarters facility for the year ended December 31, 2020

[2] Included in other assets in our Consolidated Balance Sheets.

[3] Included in other liabilities in our Consolidated Balance Sheets.