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Fair Value - Schedule of Components of Fair Value Measurements of Financial Assets and Liabilities (Details) - USD ($)
$ in Millions
Dec. 31, 2025
Dec. 31, 2024
Cash equivalents:    
Derivative assets (see Note R) $ 4.5 $ 5.1
Total assets $ 281.7 $ 216.2
Derivative asset, statement of financial position [Extensible Enumeration] Assets, Current, Other noncurrent assets Assets, Current, Other noncurrent assets
Liabilities:    
Derivative liabilities (see Note R) $ 1.2 $ 7.0
Total liabilities $ 63.6 $ 60.9
Derivative liability, statement of financial position [Extensible Enumeration] Liabilities, Noncurrent, Other Liabilities, Current Liabilities, Noncurrent, Other Liabilities, Current
Diversified investments associated with the ESU program    
Cash equivalents:    
Diversified investments associated with the ESU program (see Note L) $ 60.2 $ 55.1
Liabilities associated with the ESU program    
Liabilities:    
Liabilities associated with the ESU program (see Note L) 62.4  
Liabilities associated with the ESU program    
Liabilities:    
Liabilities associated with the ESU program (see Note L)   53.9
Bank time deposits with original maturities of three months or less    
Cash equivalents:    
Bank time deposits with original maturities of three months or less 217.0 156.0
Level 1    
Cash equivalents:    
Derivative assets (see Note R) 0.0 0.0
Total assets 60.2 55.1
Liabilities:    
Derivative liabilities (see Note R) 0.0 0.0
Total liabilities 62.4 53.9
Level 1 | Diversified investments associated with the ESU program    
Cash equivalents:    
Diversified investments associated with the ESU program (see Note L) 60.2 55.1
Level 1 | Liabilities associated with the ESU program    
Liabilities:    
Liabilities associated with the ESU program (see Note L) 62.4  
Level 1 | Liabilities associated with the ESU program    
Liabilities:    
Liabilities associated with the ESU program (see Note L)   53.9
Level 1 | Bank time deposits with original maturities of three months or less    
Cash equivalents:    
Bank time deposits with original maturities of three months or less 0.0 0.0
Level 2    
Cash equivalents:    
Derivative assets (see Note R) 4.5 5.1
Total assets 221.5 161.1
Liabilities:    
Derivative liabilities (see Note R) 1.2 7.0
Total liabilities 1.2 7.0
Level 2 | Diversified investments associated with the ESU program    
Cash equivalents:    
Diversified investments associated with the ESU program (see Note L) 0.0 0.0
Level 2 | Liabilities associated with the ESU program    
Liabilities:    
Liabilities associated with the ESU program (see Note L) 0.0  
Level 2 | Liabilities associated with the ESU program    
Liabilities:    
Liabilities associated with the ESU program (see Note L)   0.0
Level 2 | Bank time deposits with original maturities of three months or less    
Cash equivalents:    
Bank time deposits with original maturities of three months or less 217.0 156.0
Level 3    
Cash equivalents:    
Derivative assets (see Note R) 0.0 0.0
Total assets 0.0 0.0
Liabilities:    
Derivative liabilities (see Note R) 0.0 0.0
Total liabilities 0.0 0.0
Level 3 | Diversified investments associated with the ESU program    
Cash equivalents:    
Diversified investments associated with the ESU program (see Note L) 0.0 0.0
Level 3 | Liabilities associated with the ESU program    
Liabilities:    
Liabilities associated with the ESU program (see Note L) 0.0  
Level 3 | Liabilities associated with the ESU program    
Liabilities:    
Liabilities associated with the ESU program (see Note L)   0.0
Level 3 | Bank time deposits with original maturities of three months or less    
Cash equivalents:    
Bank time deposits with original maturities of three months or less $ 0.0 $ 0.0