Summary of Significant Accounting Policies Lessor Accounting (Details) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
		Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022		Sep. 30, 2021
Lessor, Lease, Description [Line Items]
Lessor, Operating Lease, Renewal Term		5 years		5 years
Direct Financing Lease, Revenue		$ 0.0		$ 0.0
Operating lease revenues		167.2	$ 158.2	500.5		$ 486.2
Variable operating lease revenues		17.7	18.8	49.0		44.7
Interest income on sales-type lease receivables		0.2	0.0	0.5		0.0
Profit recognized at sales-type lease commencement (1)		0.0	$ 0.0	1.3	[1]	$ 0.0
Sales-Type and Direct Financing Leases, Lease Receivable, to be Received, Remainder of Fiscal Year		0.3		0.3
Sales-Type and Direct Financing Leases, Lease Receivable, to be Received, Year Two		1.1		1.1
Sales-Type and Direct Financing Leases, Lease Receivable, to be Received, Year Three		1.1		1.1
Sales-Type and Direct Financing Leases, Lease Receivable, to be Received, Year Four		1.1		1.1
Sales-Type and Direct Financing Leases, Lease Receivable, to be Received, Year Five		1.1		1.1
Sales-Type and Direct Financing Leases, Lease Receivable, to be Received, after Year Five		11.2		11.2
Sales-type and Direct Financing Leases, Lease Receivable, Payments to be Received		15.9		15.9
Less: Unearned interest income		(5.2)		(5.2)
Net investment in sales-type leases (1)	[2]	10.7		10.7
Railcar Leasing and Management Services Group [Member]
Lessor, Lease, Description [Line Items]
Remaining three months of 2022	[3]	156.7		156.7
2023	[3]	519.9		519.9
2024	[3]	406.0		406.0
2025	[3]	307.4		307.4
2026	[3]	220.0		220.0
Thereafter	[3]	369.4		369.4
Total	[3]	$ 1,979.4		$ 1,979.4
Minimum | Railcar Leasing and Management Services Group [Member]
Lessor, Lease, Description [Line Items]
Lessor, Operating Lease, Term of Contract		1 year		1 year
Maximum | Railcar Leasing and Management Services Group [Member]
Lessor, Lease, Description [Line Items]
Lessor, Operating Lease, Term of Contract		10 years		10 years

[1] Included in gains on dispositions of property – lease portfolio sales on our Consolidated Statements of Operations.

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

[3] Total contractual minimum rental revenues on operating leases relates to our wholly-owned and partially-owned subsidiaries and sub-lease rental revenues associated with the Leasing Group's operating lease obligations.