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Debt - Summary (Details) - USD ($)
$ in Millions
Sep. 30, 2025
Aug. 15, 2025
Aug. 14, 2025
Dec. 31, 2024
Debt        
Total $ 1,389.1     $ 1,151.1
Less: unamortized discount and debt issuance costs (7.3)     (8.6)
Less: amounts due within one year (0.3)     (399.7)
Total long-term debt 1,381.5     742.8
Unsecured revolving credit facility maturing September 10, 2029        
Debt        
Total 238.0     0.0
Unsecured term loan due August 14, 2028        
Debt        
Total 400.0   $ 400.0  
Senior unsecured notes, interest payable semi-annually at 1.30%, effective rate of 1.53%, repaid August 15, 2025        
Debt        
Total 0.0     $ 400.0
Semi-annual rate (as a percent)   1.30%   1.30%
Effective rate (as a percent)       1.53%
Senior unsecured notes, interest payable semi-annually at 2.15%, effective rate of 2.27%, maturing August 15, 2030        
Debt        
Total $ 500.0     $ 500.0
Semi-annual rate (as a percent) 2.15%     2.15%
Effective rate (as a percent) 2.27%     2.27%
Senior unsecured notes, interest payable semi-annually at 6.85%, effective rate of 6.91%, maturing November 15, 2036        
Debt        
Total $ 250.0     $ 250.0
Semi-annual rate (as a percent) 6.85%     6.85%
Effective rate (as a percent) 6.91%     6.91%
Other notes        
Debt        
Total $ 1.1     $ 1.1