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Fair Value (Items Measured At Fair Value On A Recurring Basis) (Details) - USD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Cash equivalents:    
Derivative Asset, Statement of Financial Position [Extensible Enumeration] Assets, Current, Sundry Assets, Current, Sundry
Liabilities:    
Derivative Liability, Statement of Financial Position [Extensible Enumeration] Liabilities, Noncurrent, Other Liabilities, Current Liabilities, Noncurrent, Other Liabilities, Current
Recurring | Total    
Cash equivalents:    
Derivative assets $ 6.2 $ 2.9
Total assets 204.1 174.7
Liabilities:    
Derivative liabilities 3.5 5.9
Total liabilities 55.9 49.9
Recurring | Total | Diversified investments associated with the ESU program    
Cash equivalents:    
Diversified investments associated with the ESU program 50.4 42.8
Recurring | Total | Liabilities associated with the ESU program    
Liabilities:    
Liabilities associated with the ESU program 52.4 44.0
Recurring | Level 1    
Cash equivalents:    
Derivative assets 0.0 0.0
Total assets 50.4 42.8
Liabilities:    
Derivative liabilities 0.0 0.0
Total liabilities 52.4 44.0
Recurring | Level 1 | Diversified investments associated with the ESU program    
Cash equivalents:    
Diversified investments associated with the ESU program 50.4 42.8
Recurring | Level 1 | Liabilities associated with the ESU program    
Liabilities:    
Liabilities associated with the ESU program 52.4 44.0
Recurring | Level 2    
Cash equivalents:    
Derivative assets 6.2 2.9
Total assets 153.7 131.9
Liabilities:    
Derivative liabilities 3.5 5.9
Total liabilities 3.5 5.9
Recurring | Level 2 | Diversified investments associated with the ESU program    
Cash equivalents:    
Diversified investments associated with the ESU program 0.0 0.0
Recurring | Level 2 | Liabilities associated with the ESU program    
Liabilities:    
Liabilities associated with the ESU program 0.0 0.0
Recurring | Level 3    
Cash equivalents:    
Derivative assets 0.0 0.0
Total assets 0.0 0.0
Liabilities:    
Derivative liabilities 0.0 0.0
Total liabilities 0.0 0.0
Recurring | Level 3 | Diversified investments associated with the ESU program    
Cash equivalents:    
Diversified investments associated with the ESU program 0.0 0.0
Recurring | Level 3 | Liabilities associated with the ESU program    
Liabilities:    
Liabilities associated with the ESU program 0.0 0.0
Bank time deposits with original maturities of three months or less | Recurring | Total    
Cash equivalents:    
Bank time deposits with original maturities of three months or less 147.5 129.0
Bank time deposits with original maturities of three months or less | Recurring | Level 1    
Cash equivalents:    
Bank time deposits with original maturities of three months or less 0.0 0.0
Bank time deposits with original maturities of three months or less | Recurring | Level 2    
Cash equivalents:    
Bank time deposits with original maturities of three months or less 147.5 129.0
Bank time deposits with original maturities of three months or less | Recurring | Level 3    
Cash equivalents:    
Bank time deposits with original maturities of three months or less $ 0.0 $ 0.0