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Fair Value (Items Measured At Fair Value On A Recurring Basis) (Details) - USD ($)
$ in Millions
Dec. 31, 2022
Dec. 31, 2021
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 $ 2.9 $ 5.9
Total assets 174.7 171.3
Liabilities:    
Derivative liabilities 5.9 1.2
Total liabilities 49.9 52.1
Recurring | Total | Diversified investments associated with the Executive Stock Unit Program (ESUP)    
Cash equivalents:    
Diversified investments associated with the ESUP 42.8 51.0
Recurring | Total | Liabilities associated with the ESUP    
Liabilities:    
Liabilities associated with the ESUP 44.0 50.9
Recurring | Level 1    
Cash equivalents:    
Derivative assets 0.0 0.0
Total assets 42.8 51.0
Liabilities:    
Derivative liabilities 0.0 0.0
Total liabilities 44.0 50.9
Recurring | Level 1 | Diversified investments associated with the Executive Stock Unit Program (ESUP)    
Cash equivalents:    
Diversified investments associated with the ESUP 42.8 51.0
Recurring | Level 1 | Liabilities associated with the ESUP    
Liabilities:    
Liabilities associated with the ESUP 44.0 50.9
Recurring | Level 2    
Cash equivalents:    
Derivative assets 2.9 5.9
Total assets 131.9 120.3
Liabilities:    
Derivative liabilities 5.9 1.2
Total liabilities 5.9 1.2
Recurring | Level 2 | Diversified investments associated with the Executive Stock Unit Program (ESUP)    
Cash equivalents:    
Diversified investments associated with the ESUP 0.0 0.0
Recurring | Level 2 | Liabilities associated with the ESUP    
Liabilities:    
Liabilities associated with the ESUP 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 Executive Stock Unit Program (ESUP)    
Cash equivalents:    
Diversified investments associated with the ESUP 0.0 0.0
Recurring | Level 3 | Liabilities associated with the ESUP    
Liabilities:    
Liabilities associated with the ESUP 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 129.0 114.4
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 129.0 114.4
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