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Debt And Bank Credit Facilities (Details Of The Senior Notes) (Details) (USD $)
In Millions, unless otherwise specified
 6 Months Ended 6 Months Ended 6 Months Ended
Jun. 30, 2012
Dec. 31, 2011
Jun. 30, 2012
Floating Rate Series 2007A Mature In August 2014 [Member]
Jun. 30, 2012
Floating Rate Series 2007A Mature In August 2017 [Member]
Jun. 30, 2012
Fixed Rate Series 2011A Mature In July 2018 [Member]
Jun. 30, 2012
Fixed Rate Series 2011A Mature In July 2021 [Member]
Jun. 30, 2012
Fixed Rate Series 2011A Mature In July 2023 [Member]
Jun. 30, 2012
Maximum [Member]
Jun. 30, 2012
Maximum [Member]
Fixed Rate Series 2011A Mature In July 2021 [Member]
Jun. 30, 2012
Maximum [Member]
Fixed Rate Series 2011A Mature In July 2023 [Member]
Jun. 30, 2012
Minimum [Member]
Jun. 30, 2012
Minimum [Member]
Fixed Rate Series 2011A Mature In July 2021 [Member]
Jun. 30, 2012
Minimum [Member]
Fixed Rate Series 2011A Mature In July 2023 [Member]
Debt Instrument [Line Items]                          
Senior notes, Principal $ 750.0 $ 750.0 $ 150.0 $ 100.0 $ 100.0 $ 230.0 $ 170.0            
Variable rate terms     Floating (1) [1] Floating (1) [1]                  
Stated rate, minimum                       4.80% 4.90%
Stated rate, maximum                 5.00% 5.10%      
Debt instrument interest rate         4.10%                
Spread on variable interest rate               1.20%     1.10%    
Maturity date     Aug. 01, 2014 Aug. 01, 2017 Jul. 01, 2018 Jul. 01, 2021 Jul. 01, 2023            
[1] Interest rates vary as LIBOR varies. At June 30, 2012, the interest rate was between 1.1% and 1.2%.