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Retirement Benefits (Fair Value Disclosures) (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended 12 Months Ended 12 Months Ended
Dec. 31, 2011
Dec. 31, 2011
Pension Plans, Defined Benefit [Member]
Dec. 31, 2010
Pension Plans, Defined Benefit [Member]
Dec. 31, 2009
Pension Plans, Defined Benefit [Member]
Dec. 31, 2012
Other Postretirement Benefit Plans, Defined Benefit [Member]
Dec. 31, 2010
Other Postretirement Benefit Plans, Defined Benefit [Member]
Dec. 31, 2009
Other Postretirement Benefit Plans, Defined Benefit [Member]
Dec. 31, 2011
Hedge Funds [Member]
Pension Plans, Defined Benefit [Member]
Dec. 31, 2010
Hedge Funds [Member]
Pension Plans, Defined Benefit [Member]
Dec. 31, 2011
Hedge Funds [Member]
Other Postretirement Benefit Plans, Defined Benefit [Member]
Dec. 31, 2010
Hedge Funds [Member]
Other Postretirement Benefit Plans, Defined Benefit [Member]
Dec. 31, 2011
Equity Funds [Member]
Pension Plans, Defined Benefit [Member]
Dec. 31, 2010
Equity Funds [Member]
Pension Plans, Defined Benefit [Member]
Dec. 31, 2011
Equity Funds [Member]
Other Postretirement Benefit Plans, Defined Benefit [Member]
Dec. 31, 2010
Equity Funds [Member]
Other Postretirement Benefit Plans, Defined Benefit [Member]
Dec. 31, 2011
Equity Securities, International [Member]
Pension Plans, Defined Benefit [Member]
Dec. 31, 2010
Equity Securities, International [Member]
Pension Plans, Defined Benefit [Member]
Dec. 31, 2011
Equity Securities, International [Member]
Other Postretirement Benefit Plans, Defined Benefit [Member]
Dec. 31, 2010
Equity Securities, International [Member]
Other Postretirement Benefit Plans, Defined Benefit [Member]
Dec. 31, 2011
Fixed Income Funds, Developed Markets [Member]
Pension Plans, Defined Benefit [Member]
Dec. 31, 2010
Fixed Income Funds, Developed Markets [Member]
Pension Plans, Defined Benefit [Member]
Dec. 31, 2011
Fixed Income Funds, Developed Markets [Member]
Other Postretirement Benefit Plans, Defined Benefit [Member]
Dec. 31, 2010
Fixed Income Funds, Developed Markets [Member]
Other Postretirement Benefit Plans, Defined Benefit [Member]
Dec. 31, 2011
Fixed Income Funds, Emerging Markets [Member]
Pension Plans, Defined Benefit [Member]
Dec. 31, 2010
Fixed Income Funds, Emerging Markets [Member]
Pension Plans, Defined Benefit [Member]
Dec. 31, 2011
Fixed Income Funds, Emerging Markets [Member]
Other Postretirement Benefit Plans, Defined Benefit [Member]
Dec. 31, 2010
Fixed Income Funds, Emerging Markets [Member]
Other Postretirement Benefit Plans, Defined Benefit [Member]
Dec. 31, 2011
Equity Securities, US [Member]
Pension Plans, Defined Benefit [Member]
Dec. 31, 2010
Equity Securities, US [Member]
Pension Plans, Defined Benefit [Member]
Dec. 31, 2011
Equity Securities, US [Member]
Other Postretirement Benefit Plans, Defined Benefit [Member]
Dec. 31, 2010
Equity Securities, US [Member]
Other Postretirement Benefit Plans, Defined Benefit [Member]
Dec. 31, 2011
Real Estate [Member]
Pension Plans, Defined Benefit [Member]
Dec. 31, 2010
Real Estate [Member]
Pension Plans, Defined Benefit [Member]
Dec. 31, 2011
Real Estate [Member]
Other Postretirement Benefit Plans, Defined Benefit [Member]
Dec. 31, 2011
Other Contract [Member]
Other Postretirement Benefit Plans, Defined Benefit [Member]
Dec. 31, 2010
Other Contract [Member]
Other Postretirement Benefit Plans, Defined Benefit [Member]
Dec. 31, 2011
Other Plan Assets [Member]
Pension Plans, Defined Benefit [Member]
Dec. 31, 2010
Other Plan Assets [Member]
Pension Plans, Defined Benefit [Member]
Dec. 31, 2011
Other Plan Assets [Member]
Other Postretirement Benefit Plans, Defined Benefit [Member]
Dec. 31, 2010
Other Plan Assets [Member]
Other Postretirement Benefit Plans, Defined Benefit [Member]
Dec. 31, 2011
Fair Value, Inputs, Level 1 [Member]
Pension Plans, Defined Benefit [Member]
Dec. 31, 2010
Fair Value, Inputs, Level 1 [Member]
Pension Plans, Defined Benefit [Member]
Dec. 31, 2011
Fair Value, Inputs, Level 1 [Member]
Other Postretirement Benefit Plans, Defined Benefit [Member]
Dec. 31, 2010
Fair Value, Inputs, Level 1 [Member]
Other Postretirement Benefit Plans, Defined Benefit [Member]
Dec. 31, 2010
Fair Value, Inputs, Level 1 [Member]
Equity Funds [Member]
Pension Plans, Defined Benefit [Member]
Dec. 31, 2011
Fair Value, Inputs, Level 1 [Member]
Equity Securities, International [Member]
Pension Plans, Defined Benefit [Member]
Dec. 31, 2010
Fair Value, Inputs, Level 1 [Member]
Equity Securities, International [Member]
Pension Plans, Defined Benefit [Member]
Dec. 31, 2011
Fair Value, Inputs, Level 1 [Member]
Equity Securities, International [Member]
Other Postretirement Benefit Plans, Defined Benefit [Member]
Dec. 31, 2010
Fair Value, Inputs, Level 1 [Member]
Equity Securities, International [Member]
Other Postretirement Benefit Plans, Defined Benefit [Member]
Dec. 31, 2011
Fair Value, Inputs, Level 1 [Member]
Fixed Income Funds, Developed Markets [Member]
Pension Plans, Defined Benefit [Member]
Dec. 31, 2010
Fair Value, Inputs, Level 1 [Member]
Fixed Income Funds, Developed Markets [Member]
Pension Plans, Defined Benefit [Member]
Dec. 31, 2011
Fair Value, Inputs, Level 1 [Member]
Fixed Income Funds, Emerging Markets [Member]
Pension Plans, Defined Benefit [Member]
Dec. 31, 2011
Fair Value, Inputs, Level 1 [Member]
Equity Securities, US [Member]
Pension Plans, Defined Benefit [Member]
Dec. 31, 2010
Fair Value, Inputs, Level 1 [Member]
Equity Securities, US [Member]
Pension Plans, Defined Benefit [Member]
Dec. 31, 2011
Fair Value, Inputs, Level 1 [Member]
Equity Securities, US [Member]
Other Postretirement Benefit Plans, Defined Benefit [Member]
Dec. 31, 2010
Fair Value, Inputs, Level 1 [Member]
Equity Securities, US [Member]
Other Postretirement Benefit Plans, Defined Benefit [Member]
Dec. 31, 2011
Fair Value, Inputs, Level 1 [Member]
Real Estate [Member]
Pension Plans, Defined Benefit [Member]
Dec. 31, 2011
Fair Value, Inputs, Level 1 [Member]
Real Estate [Member]
Other Postretirement Benefit Plans, Defined Benefit [Member]
Dec. 31, 2011
Fair Value, Inputs, Level 1 [Member]
Other Plan Assets [Member]
Pension Plans, Defined Benefit [Member]
Dec. 31, 2010
Fair Value, Inputs, Level 1 [Member]
Other Plan Assets [Member]
Pension Plans, Defined Benefit [Member]
Dec. 31, 2011
Fair Value, Inputs, Level 1 [Member]
Other Plan Assets [Member]
Other Postretirement Benefit Plans, Defined Benefit [Member]
Dec. 31, 2010
Fair Value, Inputs, Level 1 [Member]
Other Plan Assets [Member]
Other Postretirement Benefit Plans, Defined Benefit [Member]
Dec. 31, 2011
Fair Value, Inputs, Level 2 [Member]
Pension Plans, Defined Benefit [Member]
Dec. 31, 2010
Fair Value, Inputs, Level 2 [Member]
Pension Plans, Defined Benefit [Member]
Dec. 31, 2011
Fair Value, Inputs, Level 2 [Member]
Other Postretirement Benefit Plans, Defined Benefit [Member]
Dec. 31, 2010
Fair Value, Inputs, Level 2 [Member]
Other Postretirement Benefit Plans, Defined Benefit [Member]
Dec. 31, 2011
Fair Value, Inputs, Level 2 [Member]
Hedge Funds [Member]
Pension Plans, Defined Benefit [Member]
Dec. 31, 2010
Fair Value, Inputs, Level 2 [Member]
Hedge Funds [Member]
Pension Plans, Defined Benefit [Member]
Dec. 31, 2011
Fair Value, Inputs, Level 2 [Member]
Hedge Funds [Member]
Other Postretirement Benefit Plans, Defined Benefit [Member]
Dec. 31, 2010
Fair Value, Inputs, Level 2 [Member]
Hedge Funds [Member]
Other Postretirement Benefit Plans, Defined Benefit [Member]
Dec. 31, 2011
Fair Value, Inputs, Level 2 [Member]
Equity Securities, International [Member]
Pension Plans, Defined Benefit [Member]
Dec. 31, 2010
Fair Value, Inputs, Level 2 [Member]
Equity Securities, International [Member]
Pension Plans, Defined Benefit [Member]
Dec. 31, 2011
Fair Value, Inputs, Level 2 [Member]
Equity Securities, International [Member]
Other Postretirement Benefit Plans, Defined Benefit [Member]
Dec. 31, 2010
Fair Value, Inputs, Level 2 [Member]
Equity Securities, International [Member]
Other Postretirement Benefit Plans, Defined Benefit [Member]
Dec. 31, 2011
Fair Value, Inputs, Level 2 [Member]
Fixed Income Funds, Developed Markets [Member]
Pension Plans, Defined Benefit [Member]
Dec. 31, 2010
Fair Value, Inputs, Level 2 [Member]
Fixed Income Funds, Developed Markets [Member]
Pension Plans, Defined Benefit [Member]
Dec. 31, 2011
Fair Value, Inputs, Level 2 [Member]
Fixed Income Funds, Developed Markets [Member]
Other Postretirement Benefit Plans, Defined Benefit [Member]
Dec. 31, 2010
Fair Value, Inputs, Level 2 [Member]
Fixed Income Funds, Developed Markets [Member]
Other Postretirement Benefit Plans, Defined Benefit [Member]
Dec. 31, 2011
Fair Value, Inputs, Level 2 [Member]
Fixed Income Funds, Emerging Markets [Member]
Pension Plans, Defined Benefit [Member]
Dec. 31, 2010
Fair Value, Inputs, Level 2 [Member]
Fixed Income Funds, Emerging Markets [Member]
Pension Plans, Defined Benefit [Member]
Dec. 31, 2011
Fair Value, Inputs, Level 2 [Member]
Fixed Income Funds, Emerging Markets [Member]
Other Postretirement Benefit Plans, Defined Benefit [Member]
Dec. 31, 2010
Fair Value, Inputs, Level 2 [Member]
Fixed Income Funds, Emerging Markets [Member]
Other Postretirement Benefit Plans, Defined Benefit [Member]
Dec. 31, 2011
Fair Value, Inputs, Level 2 [Member]
Equity Securities, US [Member]
Pension Plans, Defined Benefit [Member]
Dec. 31, 2010
Fair Value, Inputs, Level 2 [Member]
Equity Securities, US [Member]
Pension Plans, Defined Benefit [Member]
Dec. 31, 2011
Fair Value, Inputs, Level 2 [Member]
Equity Securities, US [Member]
Other Postretirement Benefit Plans, Defined Benefit [Member]
Dec. 31, 2010
Fair Value, Inputs, Level 2 [Member]
Equity Securities, US [Member]
Other Postretirement Benefit Plans, Defined Benefit [Member]
Dec. 31, 2011
Fair Value, Inputs, Level 2 [Member]
Other Contract [Member]
Other Postretirement Benefit Plans, Defined Benefit [Member]
Dec. 31, 2010
Fair Value, Inputs, Level 2 [Member]
Other Contract [Member]
Other Postretirement Benefit Plans, Defined Benefit [Member]
Dec. 31, 2011
Fair Value, Inputs, Level 2 [Member]
Other Plan Assets [Member]
Pension Plans, Defined Benefit [Member]
Dec. 31, 2010
Fair Value, Inputs, Level 2 [Member]
Other Plan Assets [Member]
Pension Plans, Defined Benefit [Member]
Dec. 31, 2011
Fair Value, Inputs, Level 2 [Member]
Other Plan Assets [Member]
Other Postretirement Benefit Plans, Defined Benefit [Member]
Dec. 31, 2010
Fair Value, Inputs, Level 2 [Member]
Other Plan Assets [Member]
Other Postretirement Benefit Plans, Defined Benefit [Member]
Dec. 31, 2011
Fair Value, Inputs, Level 3 [Member]
Pension Plans, Defined Benefit [Member]
Dec. 31, 2010
Fair Value, Inputs, Level 3 [Member]
Pension Plans, Defined Benefit [Member]
Dec. 31, 2011
Fair Value, Inputs, Level 3 [Member]
Other Postretirement Benefit Plans, Defined Benefit [Member]
Dec. 31, 2010
Fair Value, Inputs, Level 3 [Member]
Other Postretirement Benefit Plans, Defined Benefit [Member]
Dec. 31, 2011
Fair Value, Inputs, Level 3 [Member]
Hedge Funds [Member]
Pension Plans, Defined Benefit [Member]
Dec. 31, 2010
Fair Value, Inputs, Level 3 [Member]
Hedge Funds [Member]
Pension Plans, Defined Benefit [Member]
Dec. 31, 2011
Fair Value, Inputs, Level 3 [Member]
Hedge Funds [Member]
Other Postretirement Benefit Plans, Defined Benefit [Member]
Dec. 31, 2010
Fair Value, Inputs, Level 3 [Member]
Hedge Funds [Member]
Other Postretirement Benefit Plans, Defined Benefit [Member]
Dec. 31, 2011
Fair Value, Inputs, Level 3 [Member]
Equity Funds [Member]
Pension Plans, Defined Benefit [Member]
Dec. 31, 2010
Fair Value, Inputs, Level 3 [Member]
Equity Funds [Member]
Pension Plans, Defined Benefit [Member]
Dec. 31, 2011
Fair Value, Inputs, Level 3 [Member]
Equity Funds [Member]
Other Postretirement Benefit Plans, Defined Benefit [Member]
Dec. 31, 2010
Fair Value, Inputs, Level 3 [Member]
Equity Funds [Member]
Other Postretirement Benefit Plans, Defined Benefit [Member]
Dec. 31, 2010
Fair Value, Inputs, Level 3 [Member]
Equity Securities, International [Member]
Pension Plans, Defined Benefit [Member]
Dec. 31, 2010
Fair Value, Inputs, Level 3 [Member]
Equity Securities, International [Member]
Other Postretirement Benefit Plans, Defined Benefit [Member]
Dec. 31, 2010
Fair Value, Inputs, Level 3 [Member]
Fixed Income Funds, Developed Markets [Member]
Pension Plans, Defined Benefit [Member]
Dec. 31, 2010
Fair Value, Inputs, Level 3 [Member]
Fixed Income Funds, Developed Markets [Member]
Other Postretirement Benefit Plans, Defined Benefit [Member]
Dec. 31, 2011
Fair Value, Inputs, Level 3 [Member]
Real Estate [Member]
Pension Plans, Defined Benefit [Member]
Dec. 31, 2010
Fair Value, Inputs, Level 3 [Member]
Real Estate [Member]
Pension Plans, Defined Benefit [Member]
Dec. 31, 2010
Fair Value, Inputs, Level 3 [Member]
Real Estate [Member]
Other Postretirement Benefit Plans, Defined Benefit [Member]
Defined Benefit Plan, Percentage of Global Investments in Plan Assets 81.00%                                                                                                                                                                                                                            
Defined Benefit Plan, Target Allocation Percentage of Assets, Equity Securities 81.00%                                                                                                                                                                                                                            
Defined Benefit Plan, Target Allocation Percentage of Assets, Debt Securities 19.00%                                                                                                                                                                                                                            
Defined Benefit Plan, Fair Value of Plan Assets, Ending Balance   $ 7,186.3 $ 6,983.0 $ 6,008.5   $ 1,327.7 $ 1,180.7 $ 2,312.6 $ 2,020.3 $ 213.1 $ 185.2 $ 870.2 $ 812.9 $ 79.9 $ 74.5 $ 1,462.4 $ 1,868.3 $ 97.1 $ 131.6 $ 929.1 $ 791.6 $ 55.3 $ 50.5 $ 341.5 $ 336.2 $ 34.6 $ 33.9 $ 454.5 $ 589.4 $ 40.9 $ 56.0 $ 409.2 $ 126.5 $ 27.5 $ 767.9 $ 761.7 $ 406.8 $ 437.8 $ 22.7 $ 34.3 $ 1,373.0 $ 1,612.0 $ 91.6 $ 120.1 $ 10.0 $ 505.9 $ 907.1 $ 27.5 $ 67.8 $ 100.9 $ 77.6 $ 0.1 $ 317.2 $ 421.4 $ 28.0 $ 39.7 $ 271.2 $ 27.5 $ 177.7 $ 195.9 $ 8.6 $ 12.6 $ 3,556.7 $ 3,199.7 $ 1,062.2 $ 1,026.5 $ 1,064.2 $ 778.4 $ 107.8 $ 78.6 $ 956.5 $ 961.2 $ 69.6 $ 63.8 $ 828.2 $ 714.0 $ 55.3 $ 50.5 $ 341.4 $ 336.2 $ 34.6 $ 33.9 $ 137.3 $ 168.0 $ 12.9 $ 16.3 $ 767.9 $ 761.7 $ 229.1 $ 241.9 $ 14.1 $ 21.7 $ 2,256.6 $ 2,171.3 $ 185.2 $ 181.1 $ 1,248.4 $ 1,241.9 $ 105.3 $ 106.6 $ 870.2 $ 802.9 $ 79.9 $ 74.5 $ 0 $ 0 $ 0 $ 0 $ 138.0 $ 126.5 $ 0
Defined Benefit Plan, Fair Value of Plan Assets, Beginning Balance   7,186.3 6,983.0 6,008.5 1,339.0 1,327.7 1,180.7 2,312.6 2,020.3 213.1 185.2 870.2 812.9 79.9 74.5 1,462.4 1,868.3 97.1 131.6 929.1 791.6 55.3 50.5 341.5 336.2 34.6 33.9 454.5 589.4 40.9 56.0 409.2 126.5 27.5 767.9 761.7 406.8 437.8 22.7 34.3 1,373.0 1,612.0 91.6 120.1 10.0 505.9 907.1 27.5 67.8 100.9 77.6 0.1 317.2 421.4 28.0 39.7 271.2 27.5 177.7 195.9 8.6 12.6 3,556.7 3,199.7 1,062.2 1,026.5 1,064.2 778.4 107.8 78.6 956.5 961.2 69.6 63.8 828.2 714.0 55.3 50.5 341.4 336.2 34.6 33.9 137.3 168.0 12.9 16.3 767.9 761.7 229.1 241.9 14.1 21.7 2,171.3 2,132.5 181.1 205.3 1,241.9 1,381.5 106.6 140.9 802.9 658.2 74.5 63.6 3.9 0.4 3.5 0.4 126.5 85.4 0
Defined Benefit Plan, Actual Return on Plan Assets Still Held                                                                                                                                                                                         30.2 176.7 3.8 10.0 (8.1) 106.1 0.5 5.4 34.4 66.2 3.3 4.6 0.1 0 0.1 0 3.9 4.2 0
Defined Benefit Plan, Actual Return on Plan Assets Sold During Period                                                                                                                                                                                         (18.1) 5.5 (1.8) 0.6 (18.1) 0 (1.8) 0 0 11.3 0 0.6 (0.4) 0 (0.1) 0 0 (5.3) 0
Defined Benefit Plan, Business Combinations and Acquisitions, Plan Assets                                                                                                                                                                                         388.3 388.7 32.6 17.2 217.7 215.8 18.2 5.3 159.1 131.4 14.4 11.9 0.1 0 0 0 11.5 41.4 0
Defined Benefit Plan, Divestitures, Plan Assets                                                                                                                                                                                         (29.1) (27.9) (2.0) (1.4) (25.2) (21.4) (2.0) (0.6) 0 0 0 0 (3.1) (0.4) (3.4) (0.4) (3.9) 0 0
Defined Benefit Plan, Settlements, Plan Assets                                                                                                                                                                                         (286.0) (82.4) (28.5) (8.0) (159.8) (18.1) (16.2) (1.8) (126.2) (64.2) (12.3) (6.2) 0 0 (0.1) 0 0 0 0
Defined Benefit Plan, Transfers Between Measurement Levels                                                                                                                                                                                           (421.8)   (42.6)   (422.0)   (42.6)   0   0 (0.6) 0 0 0   0.8 0
Defined Benefit Plan, Estimated Future Employer Contributions in Next Fiscal Year   75.0                                                                                                                                                                                                                          
Pension and Other Postretirement Benefit Contributions, Discretionary         $ 300.0