Consolidated Balance Sheets Parenthetical - USD ($) shares in Millions, $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Accounts Receivable, Allowance for Credit Loss	$ 16.0	$ 15.6
Restricted cash, including partially-owned subsidiaries of $74.4 and $58.6	214.7	135.1
Property, plant, and equipment, at cost, including partially-owned subsidiaries of $1,917.6 and $1,927.7	9,272.6	9,105.6
Less accumulated depreciation, including partially-owned subsidiaries of $599.0 and $568.4	$ 2,385.8	$ 2,258.7
Preferred Stock, Shares Subscribed but Unissued	1.5	1.5
Preferred Stock, Shares Authorized	1.5	1.5
Common Stock, Shares Authorized	400.0	400.0
Common Stock [Member]
Common Stock, Shares, Issued	(81.1)	(83.3)
Treasury Stock [Member]
Common Stock, Shares, Issued	0.0	(0.0)
Operating Segments [Member] | Railcar Leasing and Management Services Group [Member]
Restricted cash, including partially-owned subsidiaries of $74.4 and $58.6	$ 214.7	$ 135.1
Partially-Owned Subsidiaries [Member]
Property, plant, and equipment, at cost, including partially-owned subsidiaries of $1,917.6 and $1,927.7	1,917.6	1,927.7
Less accumulated depreciation, including partially-owned subsidiaries of $599.0 and $568.4	599.0	568.4
Partially-Owned Subsidiaries [Member] | Operating Segments [Member] | Railcar Leasing and Management Services Group [Member]
Restricted cash, including partially-owned subsidiaries of $74.4 and $58.6	$ 74.4	$ 58.6