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Debt (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2012
Credit facilities: Uncommitted revolver [Member]
Dec. 31, 2011
Credit facilities: Uncommitted revolver [Member]
Dec. 31, 2012
Credit facilities: September 2013
Dec. 31, 2011
Credit facilities: September 2013
Dec. 31, 2012
Credit facilities: April 2016 [Member]
Dec. 31, 2011
Credit facilities: April 2016 [Member]
Dec. 31, 2012
Credit facilities: May 2017 [Member]
Dec. 31, 2011
Credit facilities: May 2017 [Member]
Dec. 31, 2012
Senior notes: June 2017 [Member]
Dec. 31, 2011
Senior notes: June 2017 [Member]
Dec. 31, 2012
Senior notes: May 2018 [Member]
Dec. 31, 2011
Senior notes: May 2018 [Member]
Dec. 31, 2012
Senior notes: September 2019 [Member]
Dec. 31, 2011
Senior notes: September 2019 [Member]
Dec. 31, 2012
Senior notes: March 2020 [Member]
Dec. 31, 2011
Senior notes: March 2020 [Member]
Mar. 31, 2010
Senior notes: March 2020 [Member]
Dec. 31, 2012
Senior notes: November 2021 [Member]
Dec. 31, 2011
Senior notes: November 2021 [Member]
Dec. 31, 2012
Senior notes: June 2022 [Member]
Jun. 30, 2012
Senior notes: June 2022 [Member]
Dec. 31, 2011
Senior notes: June 2022 [Member]
Dec. 31, 2012
Senior notes: May 2023 [Member]
Dec. 31, 2011
Senior notes: May 2023 [Member]
Dec. 31, 2012
Senior notes: March 2035 [Member]
Dec. 31, 2011
Senior notes: March 2035 [Member]
Dec. 31, 2012
Senior notes: March 2040 [Member]
Dec. 31, 2011
Senior notes: March 2040 [Member]
Dec. 31, 2012
Senior notes: May 2041 [Member]
Dec. 31, 2011
Senior notes: May 2041 [Member]
Dec. 31, 2012
Debentures: May 2021 [Member]
Dec. 31, 2011
Debentures: May 2021 [Member]
Dec. 31, 2012
Debentures: September 2035 [Member]
Dec. 31, 2011
Debentures: September 2035 [Member]
Dec. 31, 2012
Tax-exempt: 2013 - 2037 [Member]
Dec. 31, 2011
Tax-exempt: 2013 - 2037 [Member]
Dec. 31, 2012
Other: 2013 - 2046 [Member]
Dec. 31, 2011
Other: 2013 - 2046 [Member]
Debt Instrument [Line Items]                                                                                
Interest Rate     Variable   Variable   Variable   Variable                                                              
Interest Rate (in percentage)     1.35%               6.875% 6.875% 3.80%   5.50%   5.00%   5.00% 5.25%   3.55% 3.55%   4.75%   6.086%   6.20%   5.70%   9.25% 9.25% 7.40% 7.40%        
Interest Rate, minimum                                                                         0.13%   5.00%  
Interest Rate, maximum                                                                         5.625%   11.90%  
Principal $ 7,150.2 $ 7,092.2 $ 13.9 $ 0 $ 0 $ 17.2 $ 25.0 $ 17.2 $ 0 $ 0 $ 0 $ 750.0 $ 700.0 $ 700.0 $ 650.0 $ 650.0 $ 850.0 $ 850.0   $ 600.0 $ 600.0 $ 850.0   $ 0 $ 550.0 $ 550.0 $ 275.7 $ 275.7 $ 650.0 $ 650.0 $ 600.0 $ 600.0 $ 35.3 $ 35.3 $ 165.2 $ 165.2 $ 1,097.9 $ 1,142.2 $ 87.2 $ 89.4
Discount (79.7) (170.4) 0 0 0 0 0 0 0 0 0 (75.8) (0.2) (0.2) (3.4) (3.8) (0.1) (0.1)   0 0 (2.2)   0 (1.3) (1.4) (24.9) (25.5) (0.5) (0.5) (3.4) (3.4) (1.9) (2.0) (41.4) (41.9) (0.4) (15.8) 0 0
Carrying Value 7,070.5 6,921.8 13.9 0 0 17.2 25.0 17.2 0 0 0 674.2 699.8 699.8 646.6 646.2 849.9 849.9   600.0 600.0 847.8   0 548.7 548.6 250.8 250.2 649.5 649.5 596.6 596.6 33.4 33.3 123.8 123.3 1,097.5 1,126.4 87.2 89.4
Less: current portion (19.4) (34.8)                                                                            
Long-term portion $ 7,051.1 $ 6,887.0