v3.26.3
Fair Value Measurements (Assets and Liabilities at Fair Value) (Details) - USD ($)
$ in Millions
Sep. 30, 2026
Dec. 31, 2025
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total derivative instruments $ 930.8 $ 248.8
SMAs   76.2
Other investments   1,631.5
Total — fair value 1,060.9 1,707.7
Total assets 1,991.7 1,956.5
Derivative instruments 293.4 259.7
Total liabilities 293.4 259.7
Quoted prices in active markets for identical assets (Level 1)    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total derivative instruments 0.0 0.0
SMAs   0.0
Other investments   278.1
Total — fair value 174.3 278.1
Total assets 174.3 278.1
Total liabilities 0.0 0.0
Significant other observable inputs (Level 2)    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total derivative instruments 930.8 248.8
SMAs   76.2
Other investments   0.1
Total — fair value 0.0 76.3
Total assets 930.8 325.1
Total liabilities 293.4 259.7
Significant unobservable inputs (Level 3)    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total derivative instruments 0.0 0.0
SMAs   0.0
Other investments   1,353.3
Total — fair value 886.6 1,353.3
Total assets 886.6 1,353.3
Total liabilities 0.0 0.0
Cross-currency and interest rate derivative contracts    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total derivative instruments 907.6 240.9
Derivative instruments 279.1 248.2
Cross-currency and interest rate derivative contracts | Quoted prices in active markets for identical assets (Level 1)    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total derivative instruments 0.0 0.0
Derivative instruments 0.0 0.0
Cross-currency and interest rate derivative contracts | Significant other observable inputs (Level 2)    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total derivative instruments 907.6 240.9
Derivative instruments 279.1 248.2
Cross-currency and interest rate derivative contracts | Significant unobservable inputs (Level 3)    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total derivative instruments 0.0 0.0
Derivative instruments 0.0 0.0
Foreign currency forward and option contracts    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total derivative instruments 4.5 0.1
Derivative instruments 2.5 2.8
Foreign currency forward and option contracts | Quoted prices in active markets for identical assets (Level 1)    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total derivative instruments 0.0 0.0
Derivative instruments 0.0 0.0
Foreign currency forward and option contracts | Significant other observable inputs (Level 2)    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total derivative instruments 4.5 0.1
Derivative instruments 2.5 2.8
Foreign currency forward and option contracts | Significant unobservable inputs (Level 3)    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total derivative instruments 0.0 0.0
Derivative instruments 0.0 0.0
Other    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total derivative instruments 18.7 7.8
Derivative instruments 11.8 8.7
Other | Quoted prices in active markets for identical assets (Level 1)    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total derivative instruments 0.0 0.0
Derivative instruments 0.0 0.0
Other | Significant other observable inputs (Level 2)    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total derivative instruments 18.7 7.8
Derivative instruments 11.8 8.7
Other | Significant unobservable inputs (Level 3)    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total derivative instruments 0.0 0.0
Derivative instruments $ 0.0 $ 0.0