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Stock Compensation Plans (Narrative) (Details) (USD $)
In Millions, except Share data, unless otherwise specified
3 Months Ended 9 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended 0 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Performance Awards [Member]
Y
Sep. 30, 2011
Performance Awards [Member]
Dec. 31, 2011
Performance Awards [Member]
Sep. 30, 2012
Long-Term Incentive Plan [Member]
Sep. 30, 2012
Margin Incentive Plan [Member]
Sep. 30, 2012
Margin Incentive Plan [Member]
Minimum [Member]
Sep. 30, 2012
Margin Incentive Plan [Member]
Maximum [Member]
Sep. 30, 2012
Settled Stock Appreciation Rights (SSARs) [Member]
Sep. 30, 2011
Settled Stock Appreciation Rights (SSARs) [Member]
Sep. 30, 2012
Settled Stock Appreciation Rights (SSARs) [Member]
Y
Sep. 30, 2011
Settled Stock Appreciation Rights (SSARs) [Member]
Apr. 26, 2012
Restricted Stock [Member]
Sep. 30, 2012
Restricted Stock [Member]
Y
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                  
Number of share approved for issuance 10,000,000   10,000,000                            
Weighted average grant-date fair value of performance awards granted         $ 52.14 $ 53.04               $ 22.50 $ 22.54    
Number of awards granted         1,202,944     1,058,896 144,048         305,900   19,251  
Share-based compensation performance period               3 years   3 years 5 years            
Share-based compensation cost not yet recognized         $ 51.1             $ 8.7   $ 8.7      
Share-based compensation, recognition period of unrecognized compensation cost         2                 3      
Stock compensation expense 9.6 6.4 29.0 18.1               1.0 0.6 2.8 1.9   0.9
Weighted average remaining contractual life of SSARs outstanding, in years                           4      
Total fair value of SSARs vested                           2.5      
Number of shares not vested         3,284,586   2,207,981         576,300   576,300      
Total intrinsic value of outstanding SSARs                       9.7   9.7      
Total intrinsic value of exercisable SSARs                           6.6      
Total intrinsic value of SSARs exercised                           0.9      
Weighted-average period for compensation cost expected to be recognized, in years                                 3
Restricted common stocks issued                               13,986  
Shares available for grant 4,100,000   4,100,000                            
Options exercised     2,000                            
Option exercise prices per share, exercised $ 20.85   $ 20.85                            
The total intrinsic value of options exercised     0.1                            
Cash received from stock option exercises     $ 0.1