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Long-Term Debt (Schedule Of Long-Term Debt Instruments) (Details) - USD ($)
$ in Millions
9 Months Ended
Sep. 30, 2017
Dec. 31, 2016
Debt Instrument [Line Items]    
Line of Credit Facility, Expiration Date Aug. 07, 2020  
Debt Instrument, Issuer The issuer of the senior notes is an indirect 100% owned finance subsidiary of the Parent, and the Parent fully and unconditionally guarantees the securities.  
Unsecured Debt [Member] | Due November 30, 2022 [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Maturity Date Nov. 30, 2022  
Debt instrument, interest rate, stated percentage 3.125%  
Debt Instrument, Face Amount $ 600.0  
Unsecured Debt [Member] | Due January 30, 2024 [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Maturity Date Jan. 30, 2024  
Debt instrument, interest rate, stated percentage 4.00%  
Debt Instrument, Face Amount $ 600.0  
Unsecured Debt [Member] | Due January 15, 2026 [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Maturity Date Jan. 15, 2026  
Debt instrument, interest rate, stated percentage 3.75%  
Debt Instrument, Face Amount $ 500.0  
Unsecured Debt [Member] | Due November 30, 2043 [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Maturity Date Nov. 30, 2043  
Debt instrument, interest rate, stated percentage 5.375%  
Debt Instrument, Face Amount $ 400.0  
Carrying Value [Member]    
Debt Instrument [Line Items]    
Long-term Debt 2,075.3 $ 2,102.4
Carrying Value [Member] | Line of Credit [Member]    
Debt Instrument [Line Items]    
Line of credit facility, amount outstanding 0.0 28.7
Carrying Value [Member] | Unsecured Debt [Member]    
Debt Instrument [Line Items]    
Long-term Debt 2,075.3  
Carrying Value [Member] | Unsecured Debt [Member] | Due November 30, 2022 [Member]    
Debt Instrument [Line Items]    
Long-term Debt 596.8 596.3
Carrying Value [Member] | Unsecured Debt [Member] | Due January 30, 2024 [Member]    
Debt Instrument [Line Items]    
Long-term Debt 593.8 593.2
Carrying Value [Member] | Unsecured Debt [Member] | Due January 15, 2026 [Member]    
Debt Instrument [Line Items]    
Long-term Debt 494.9 494.5
Carrying Value [Member] | Unsecured Debt [Member] | Due November 30, 2043 [Member]    
Debt Instrument [Line Items]    
Long-term Debt 389.8 389.7
Fair Value [Member]    
Debt Instrument [Line Items]    
Long-term Debt 2,264.5 2,206.5
Fair Value [Member] | Line of Credit [Member]    
Debt Instrument [Line Items]    
Line of credit facility, amount outstanding 0.0 28.7
Fair Value [Member] | Unsecured Debt [Member] | Due November 30, 2022 [Member]    
Debt Instrument [Line Items]    
Long-term Debt 615.6 604.7
Fair Value [Member] | Unsecured Debt [Member] | Due January 30, 2024 [Member]    
Debt Instrument [Line Items]    
Long-term Debt 636.4 625.3
Fair Value [Member] | Unsecured Debt [Member] | Due January 15, 2026 [Member]    
Debt Instrument [Line Items]    
Long-term Debt 524.6 506.4
Fair Value [Member] | Unsecured Debt [Member] | Due November 30, 2043 [Member]    
Debt Instrument [Line Items]    
Long-term Debt $ 487.9 $ 441.4