Debt (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Commercial Paper and Borrowings Under Bank Credit Facilities
Balance	$ 10.4	$ 11.0
Weighted average interest rate	4.24%	3.86%
Outstanding balances of debt obligations and the applicable interest rates
Total debt principal	$ (8,270.9)	$ (7,450.6)
Debt discount, net	(51.6)	(54.5)
Debt adjustment for fair value hedges	(4.0)	(8.0)
Recourse Debt	8,215.3	7,388.1
Second Line of Credit US
Debt Instrument [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	350.0	250.0
3.25% Notes due March 2025
Outstanding balances of debt obligations and the applicable interest rates
Total Debt	300.0	300.0
3.25% Notes due September 2026
Outstanding balances of debt obligations and the applicable interest rates
Total Debt	350.0	350.0
5.40% Notes due March 2027
Outstanding balances of debt obligations and the applicable interest rates
Total Debt	350.0	0.0
3.85% Notes due March 2027
Outstanding balances of debt obligations and the applicable interest rates
Total Debt	300.0	300.0
3.50% Notes due March 2028
Outstanding balances of debt obligations and the applicable interest rates
Total Debt	300.0	300.0
4.55% Notes due November 2028
Outstanding balances of debt obligations and the applicable interest rates
Total Debt	300.0	300.0
4.70% Notes due April 2029
Outstanding balances of debt obligations and the applicable interest rates
Total Debt	500.0	500.0
4.00% Notes due June 2030
Outstanding balances of debt obligations and the applicable interest rates
Total Debt	500.0	500.0
1.90% Notes due June 2031
Outstanding balances of debt obligations and the applicable interest rates
Total Debt	400.0	400.0
3.50% Notes due June 2032
Outstanding balances of debt obligations and the applicable interest rates
Total Debt	400.0	400.0
4.90% Notes due March 2033
Outstanding balances of debt obligations and the applicable interest rates
Total Debt	400.0	400.0
5.45% Notes due September 2033
Outstanding balances of debt obligations and the applicable interest rates
Total Debt	400.0	400.0
6.05% Notes due March 2034
Outstanding balances of debt obligations and the applicable interest rates
Total Debt	500.0	300.0
6.90% Notes due May 2034
Outstanding balances of debt obligations and the applicable interest rates
Total Debt	400.0	400.0
3.10% Notes due June 2051
Outstanding balances of debt obligations and the applicable interest rates
Total Debt	300.0	300.0
6.05% Notes due May 2054
Outstanding balances of debt obligations and the applicable interest rates
Total Debt	250.0	250.0
4.35% Notes due February 2024
Outstanding balances of debt obligations and the applicable interest rates
Total Debt	550.0	550.0
1.00% Notes due March 2025
Outstanding balances of debt obligations and the applicable interest rates
Total Debt	400.0	0.0
1.13% Notes due August 2025
Outstanding balances of debt obligations and the applicable interest rates
Total Debt	0.0	300.0
0.90% Schuldschein loan due October 2026
Outstanding balances of debt obligations and the applicable interest rates
Total Debt	103.5	110.4
1.07% Notes due November 2026
Outstanding balances of debt obligations and the applicable interest rates
Total Debt	103.5	110.4
5.23% Schuldschein loan due November 2026
Outstanding balances of debt obligations and the applicable interest rates
Total Debt	23.8	25.4
4.37% Schuldschein loan due May 2027
Outstanding balances of debt obligations and the applicable interest rates
Total Debt	77.7	82.8
1.17% Schuldschein loan due October 2028
Outstanding balances of debt obligations and the applicable interest rates
Total Debt	38.8	41.4
0.85% Notes due May 2024
Outstanding balances of debt obligations and the applicable interest rates
Total Debt	53.8	57.4
8.39% - 8.83% Term loan due June 2027 (4)
Outstanding balances of debt obligations and the applicable interest rates
Total Debt	77.7	82.8
8.43% - 8.94% Term loan due February 2029 (4)
Outstanding balances of debt obligations and the applicable interest rates
Total Debt	46.7	24.0
Total unsecured fixed rate debt
Outstanding balances of debt obligations and the applicable interest rates
Total Debt	7,663.4	7,087.8
6.47% Notes due January 2026
Outstanding balances of debt obligations and the applicable interest rates
Total debt principal	(100.0)	(100.0)
6.30% Notes due January 2028
Outstanding balances of debt obligations and the applicable interest rates
Total debt principal	(50.0)	(50.0)
7.14% Notes due September 2029
Outstanding balances of debt obligations and the applicable interest rates
Total debt principal	(50.0)	(50.0)
4.32% Loan due December 2025
Outstanding balances of debt obligations and the applicable interest rates
Total debt principal	(125.3)	0.0
Total Recourse Floating Rate Debt [Member]
Outstanding balances of debt obligations and the applicable interest rates
Total Debt	607.5	362.8
Total Recourse Floating Rate Debt [Member] | Rail North America [Member]
Outstanding balances of debt obligations and the applicable interest rates
Total Debt	200.0	200.0
4.32% Loan due December 2025
Outstanding balances of debt obligations and the applicable interest rates
Total debt principal	(113.9)	(121.4)
5.02% Loan due March 2031
Outstanding balances of debt obligations and the applicable interest rates
Total debt principal	(77.7)	0.0
UNITED STATES
Outstanding balances of debt obligations and the applicable interest rates
Total Debt	6,900.0	6,250.0
Europe
Outstanding balances of debt obligations and the applicable interest rates
Total debt principal	(407.5)	(162.8)
Total Debt	618.5	736.8
INDIA
Outstanding balances of debt obligations and the applicable interest rates
Total Debt	144.9	101.0
Recourse Fixed Rate Debt Unsecured Twenty Six
Outstanding balances of debt obligations and the applicable interest rates
Total Debt	36.2	0.0
Recourse Fixed Rate Debt Unsecured Twenty Nine
Outstanding balances of debt obligations and the applicable interest rates
Total Debt	$ 103.5	110.4
Interest rate, stated percentage	3.62%
Recourse Fixed Rate Debt Unsecured Thirty
Outstanding balances of debt obligations and the applicable interest rates
Total Debt	$ 0.0	115.8
Recourse Fixed Rate Debt Unsecured Thirty One
Outstanding balances of debt obligations and the applicable interest rates
Total Debt	47.9	49.4
Recourse Fixed Rate Debt Unsecured Thirty Two
Outstanding balances of debt obligations and the applicable interest rates
Total Debt	26.9	27.6
Recourse Fixed Rate Debt Unsecured Thirty Four
Outstanding balances of debt obligations and the applicable interest rates
Total Debt	23.4	0.0
Recourse Floating Rate Debt Unsecured Seven
Outstanding balances of debt obligations and the applicable interest rates
Total debt principal	(38.8)	(41.4)
Recourse Floating Rate Debt Unsecured Eight
Outstanding balances of debt obligations and the applicable interest rates
Total debt principal	(51.8)	0.0
Line of Credit US [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	$ 600.0	$ 600.0