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Financial Data of Business Segments (Details) railcar in Thousands | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2025 USD ($) | Sep. 30, 2024 USD ($) | Sep. 30, 2025 USD ($) Segment | Sep. 30, 2024 USD ($) | Sep. 23, 2025 railcar | Dec. 31, 2024 USD ($)
Segment Reporting [Abstract] |  |  |  |  |  |
Number of business segments | Segment |  |  | 3 |  |  |
Payment for Management Fee | $ 1,400,000 | $ 1,100,000 | $ 4,100,000 | $ 2,900,000 |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |  |  |
Lease revenue | 377,100,000 | 351,700,000 | 1,105,500,000 | 1,024,600,000 |  |
Non-dedicated engine revenue | 22,500,000 | 18,100,000 | 64,500,000 | 45,000,000.0 |  |
Other revenue | 39,700,000 | 35,600,000 | 121,400,000 | 102,400,000 |  |
Total Revenues | 439,300,000 | 405,400,000 | 1,291,400,000 | 1,172,000,000 |  |
Maintenance expense | 112,500,000 | 95,900,000 | 320,500,000 | 283,900,000 |  |
Depreciation expense | 109,500,000 | 103,400,000 | 320,000,000.0 | 297,900,000 |  |
Operating lease expense | 7,100,000 | 8,000,000.0 | 21,800,000 | 26,000,000.0 |  |
Other operating expense | 16,800,000 | 14,100,000 | 49,300,000 | 41,500,000 |  |
Total Expenses | 245,900,000 | 221,400,000 | 711,600,000 | 649,300,000 |  |
Net gain on asset dispositions | 23,100,000 | 48,500,000 | 97,000,000.0 | 110,300,000 |  |
Interest (expense) income, net | (98,200,000) | (88,900,000) | (289,300,000) | (249,500,000) |  |
Other (expense) income | 6,500,000 | (900,000) | 2,700,000 | (10,900,000) |  |
Share of affiliates' earnings (pre-tax) | 53,300,000 | 35,300,000 | 109,200,000 | 75,900,000 |  |
Segment profit (loss) | 178,100,000 | 178,000,000.0 | 499,400,000 | 448,500,000 |  |
Selling, general and administrative expense | 66,200,000 | 57,200,000 | 181,000,000.0 | 171,700,000 |  |
Income taxes | 29,700,000 | 31,800,000 | 82,100,000 | 69,100,000 |  |
Net income | 82,200,000 | 89,000,000.0 | 236,300,000 | 207,700,000 |  |
Net gains on disposition of owned assets | 17,200,000 | 44,900,000 | 82,400,000 | 98,400,000 |  |
Residual sharing income | 100,000 | 100,000 | 400,000 | 300,000 |  |
Non-remarketing net gains | 5,800,000 | 3,500,000 | 17,800,000 | 11,600,000 |  |
Asset impairments |  |  | 3,600,000 | 0 |  |
Net gain on asset dispositions | 23,100,000 | 48,500,000 | 97,000,000.0 | 110,300,000 |  |
Payments for (Proceeds from) Businesses, Interest in Affiliates, and Productive Assets Acquired | 361,700,000 | 504,500,000 | 877,000,000.0 | 1,325,100,000 |  |
Investments in affiliated companies | 746,100,000 |  | 746,100,000 |  |  | $ 663,300,000
Identifiable assets | 13,305,800,000 |  | 13,305,800,000 |  |  | 12,296,500,000
Income taxes, affiliates' earnings | 13,300,000 | 8,900,000 | 28,100,000 | 17,200,000 |  |
DB Cargo AG | Railcar Acquisition |  |  |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |  |  |
Number of assets acquired | railcar |  |  |  |  | 6 |
Rail North America |  |  |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |  |  |
Lease revenue | 264,100,000 | 249,200,000 | 786,900,000 | 727,800,000 |  |
Other revenue | 32,400,000 | 29,300,000 | 98,600,000 | 86,100,000 |  |
Total Revenues | 296,500,000 | 278,500,000 | 885,500,000 | 813,900,000 |  |
Maintenance expense | 93,100,000 | 77,700,000 | 261,100,000 | 228,000,000.0 |  |
Depreciation expense | 72,100,000 | 69,200,000 | 214,200,000 | 201,100,000 |  |
Operating lease expense | 7,100,000 | 8,000,000.0 | 21,800,000 | 26,000,000.0 |  |
Other operating expense | 8,200,000 | 7,000,000.0 | 23,500,000 | 20,100,000 |  |
Total Expenses | 180,500,000 | 161,900,000 | 520,600,000 | 475,200,000 |  |
Net gain on asset dispositions | 21,300,000 | 46,700,000 | 92,500,000 | 105,800,000 |  |
Interest (expense) income, net | (64,900,000) | (60,200,000) | (194,000,000.0) | (169,900,000) |  |
Other (expense) income | (1,600,000) | (800,000) | (7,100,000) | (3,200,000) |  |
Share of affiliates' earnings (pre-tax) | (100,000) | 100,000 | (200,000) | 100,000 |  |
Segment profit (loss) | 70,700,000 | 102,400,000 | 256,100,000 | 271,500,000 |  |
Net gains on disposition of owned assets | 16,400,000 | 43,600,000 | 81,000,000.0 | 96,300,000 |  |
Residual sharing income | 100,000 | 100,000 | 400,000 | 300,000 |  |
Non-remarketing net gains | 4,800,000 | 3,000,000.0 | 14,700,000 | 9,200,000 |  |
Asset impairments |  |  | 3,600,000 |  |  |
Net gain on asset dispositions | 21,300,000 | 46,700,000 | 92,500,000 | 105,800,000 |  |
Payments for (Proceeds from) Businesses, Interest in Affiliates, and Productive Assets Acquired | 142,600,000 | 325,900,000 | 502,500,000 | 955,700,000 |  |
Identifiable assets | 7,886,600,000 |  | 7,886,600,000 |  |  | 7,751,600,000
Rail North America | RailPulse |  |  |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |  |  |
Investments in affiliated companies | 0 |  | 0 |  |  | 200,000
Rail International |  |  |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |  |  |
Lease revenue | 94,200,000 | 86,300,000 | 267,400,000 | 248,900,000 |  |
Other revenue | 5,200,000 | 4,300,000 | 16,300,000 | 10,600,000 |  |
Total Revenues | 99,400,000 | 90,600,000 | 283,700,000 | 259,500,000 |  |
Maintenance expense | 18,100,000 | 17,000,000.0 | 55,500,000 | 52,700,000 |  |
Depreciation expense | 23,000,000.0 | 20,300,000 | 64,800,000 | 58,600,000 |  |
Operating lease expense | 0 | 0 | 0 | 0 |  |
Other operating expense | 4,800,000 | 3,700,000 | 14,300,000 | 10,800,000 |  |
Total Expenses | 45,900,000 | 41,000,000.0 | 134,600,000 | 122,100,000 |  |
Net gain on asset dispositions | 1,800,000 | 1,700,000 | 4,500,000 | 3,700,000 |  |
Interest (expense) income, net | (20,700,000) | (18,500,000) | (59,800,000) | (52,700,000) |  |
Other (expense) income | (200,000) | 1,100,000 | (1,500,000) | 800,000 |  |
Share of affiliates' earnings (pre-tax) | 0 | 0 | 0 | 0 |  |
Segment profit (loss) | 34,400,000 | 33,900,000 | 92,300,000 | 89,200,000 |  |
Net gains on disposition of owned assets | 800,000 | 1,200,000 | 1,400,000 | 1,300,000 |  |
Residual sharing income | 0 | 0 | 0 | 0 |  |
Non-remarketing net gains | 1,000,000.0 | 500,000 | 3,100,000 | 2,400,000 |  |
Asset impairments |  |  | 0 |  |  |
Net gain on asset dispositions | 1,800,000 | 1,700,000 | 4,500,000 | 3,700,000 |  |
Payments for (Proceeds from) Businesses, Interest in Affiliates, and Productive Assets Acquired | 66,100,000 | 80,600,000 | 209,900,000 | 190,100,000 |  |
Investments in affiliated companies | 0 |  | 0 |  |  | 0
Identifiable assets | 2,569,800,000 |  | 2,569,800,000 |  |  | 2,233,300,000
Engine Leasing |  |  |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |  |  |
Lease revenue | 10,400,000 | 8,100,000 | 26,600,000 | 24,300,000 |  |
Non-dedicated engine revenue | 22,500,000 | 18,100,000 | 64,500,000 | 45,000,000.0 |  |
Other revenue | 0 | 0 | 0 | 0 |  |
Total Revenues | 32,900,000 | 26,200,000 | 91,100,000 | 69,300,000 |  |
Maintenance expense | 0 | 0 | 0 | 0 |  |
Depreciation expense | 10,300,000 | 10,100,000 | 29,200,000 | 27,100,000 |  |
Operating lease expense | 0 | 0 | 0 | 0 |  |
Other operating expense | 2,900,000 | 2,600,000 | 8,600,000 | 7,000,000.0 |  |
Total Expenses | 13,200,000 | 12,700,000 | 37,800,000 | 34,100,000 |  |
Net gain on asset dispositions | 0 | 0 | 0 | 600,000 |  |
Interest (expense) income, net | (12,700,000) | (11,300,000) | (36,500,000) | (30,300,000) |  |
Other (expense) income | 0 | 100,000 | 100,000 | 300,000 |  |
Share of affiliates' earnings (pre-tax) | 53,400,000 | 35,200,000 | 109,400,000 | 75,800,000 |  |
Segment profit (loss) | 60,400,000 | 37,500,000 | 126,300,000 | 81,600,000 |  |
Net gains on disposition of owned assets | 0 | 0 | 0 | 600,000 |  |
Residual sharing income | 0 | 0 | 0 | 0 |  |
Non-remarketing net gains | 0 | 0 | 0 | 0 |  |
Asset impairments |  |  | 0 |  |  |
Net gain on asset dispositions | 0 | 0 | 0 | 600,000 |  |
Payments for (Proceeds from) Businesses, Interest in Affiliates, and Productive Assets Acquired | 147,100,000 | 94,800,000 | 147,100,000 | 166,100,000 |  |
Investments in affiliated companies | 746,100,000 |  | 746,100,000 |  |  | 663,100,000
Identifiable assets | 1,848,200,000 |  | 1,848,200,000 |  |  | 1,653,400,000
Other |  |  |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |  |  |
Lease revenue | 8,400,000 | 8,100,000 | 24,600,000 | 23,600,000 |  |
Other revenue | 2,100,000 | 2,000,000.0 | 6,500,000 | 5,700,000 |  |
Total Revenues | 10,500,000 | 10,100,000 | 31,100,000 | 29,300,000 |  |
Maintenance expense | 1,300,000 | 1,200,000 | 3,900,000 | 3,200,000 |  |
Depreciation expense | 4,100,000 | 3,800,000 | 11,800,000 | 11,100,000 |  |
Operating lease expense | 0 | 0 | 0 | 0 |  |
Other operating expense | 900,000 | 800,000 | 2,900,000 | 3,600,000 |  |
Total Expenses | 6,300,000 | 5,800,000 | 18,600,000 | 17,900,000 |  |
Net gain on asset dispositions | 0 | 100,000 | 0 | 200,000 |  |
Interest (expense) income, net | 100,000 | 1,100,000 | 1,000,000.0 | 3,400,000 |  |
Other (expense) income | 8,300,000 | (1,300,000) | 11,200,000 | (8,800,000) |  |
Share of affiliates' earnings (pre-tax) | 0 | 0 | 0 | 0 |  |
Segment profit (loss) | 12,600,000 | 4,200,000 | 24,700,000 | 6,200,000 |  |
Net gains on disposition of owned assets | 0 | 100,000 | 0 | 200,000 |  |
Residual sharing income | 0 | 0 | 0 | 0 |  |
Non-remarketing net gains | 0 | 0 | 0 | 0 |  |
Asset impairments |  |  | 0 |  |  |
Net gain on asset dispositions | 0 | 100,000 | 0 | 200,000 |  |
Payments for (Proceeds from) Businesses, Interest in Affiliates, and Productive Assets Acquired | 5,900,000 | $ 3,200,000 | 17,500,000 | $ 13,200,000 |  |
Investments in affiliated companies | 0 |  | 0 |  |  | 0
Identifiable assets | $ 1,001,200,000 |  | $ 1,001,200,000 |  |  | $ 658,200,000

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