Note 1. Summary of Significant Accounting Policies Lessee Accounting (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2020		Dec. 31, 2019
Lessee, Lease, Description [Line Items]
Lessee, Operating Lease, Renewal Term		5 years
Lessee, Operating Lease, Termination Option Term		one year
Finance Lease, Principal Payments		$ 0.0
Operating lease expense		15.8		$ 18.0
Short-term lease expense		$ 2.1		$ 4.1
Weighted average remaining lease term		11 years 3 months 18 days		4 years 9 months 18 days
Weighted average discount rate		3.30%		4.10%
Operating Lease, Payments		$ 15.8		$ 18.0
Right-of-use assets recognized in exchange for new lease liabilities (3)		56.3	[1]	10.3
2021		12.2
2022		15.2
2023		13.5
2024		9.2
2025		6.7
Thereafter		63.4
Lessee, Operating Lease, Liability, to be Paid		120.2
Less: Present value adjustment		(20.3)
Less: Lease incentives		$ (3.0)
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		16 years
Railcar Leasing and Management Services Group [Member]
Lessee, Lease, Description [Line Items]
2021		$ 8.6
2022		7.8
2023		6.0
2024		2.9
2025		0.9
Thereafter		0.6
Lessee, Operating Lease, Liability, to be Paid		26.8
Consolidated Subsidiaries, Excluding Leasing [Member]
Lessee, Lease, Description [Line Items]
2021		3.6
2022		7.4
2023		7.5
2024		6.3
2025		5.8
Thereafter		62.8
Lessee, Operating Lease, Liability, to be Paid		93.4
Other Assets [Member]
Lessee, Lease, Description [Line Items]
Right-of-use assets (1)	[2]	77.1		44.2
Other Liabilities
Lessee, Lease, Description [Line Items]
Lease liabilities (2)	[3]	$ 96.9		$ 44.8

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

[2] Included in other assets in our Consolidated Balance Sheet. See Note 11 for more information on the impairment of right-of-use assets.

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