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Fair Value (Items Measured At Fair Value On A Recurring Basis) (Details) - Fair Value, Measurements, Recurring - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Estimate of Fair Value Measurement [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Bank time deposits with original maturities of three months or less $ 159.1 $ 236.4
Derivative assets (see Note T) 1.2 3.9
Diversified investments associated with the ESUP (see Note M) 32.7 34.0
Total assets 193.0 274.3
Derivative liabilities 4.7 1.9
Liabilities associated with the ESUP 33.7 34.4
Total liabilities 38.4 36.3
Level 1    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Bank time deposits with original maturities of three months or less 0.0 0.0
Derivative assets (see Note T) 0.0 0.0
Diversified investments associated with the ESUP (see Note M) 32.7 34.0
Total assets 32.7 34.0
Derivative liabilities 0.0 0.0
Liabilities associated with the ESUP 33.7 34.4
Total liabilities 33.7 34.4
Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Bank time deposits with original maturities of three months or less 159.1 236.4
Derivative assets (see Note T) 1.2 3.9
Diversified investments associated with the ESUP (see Note M) 0.0 0.0
Total assets 160.3 240.3
Derivative liabilities 4.7 1.9
Liabilities associated with the ESUP 0.0 0.0
Total liabilities 4.7 1.9
Level 3    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Bank time deposits with original maturities of three months or less 0.0 0.0
Derivative assets (see Note T) 0.0 0.0
Diversified investments associated with the ESUP (see Note M) 0.0 0.0
Total assets 0.0 0.0
Derivative liabilities 0.0 0.0
Liabilities associated with the ESUP 0.0 0.0
Total liabilities $ 0.0 $ 0.0