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Debt (Details Textual1) (USD $)
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3 Months Ended | 12 Months Ended | 3 Months Ended | 12 Months Ended | 3 Months Ended | 12 Months Ended | 3 Months Ended | 12 Months Ended | 3 Months Ended | 12 Months Ended | 3 Months Ended | 3 Months Ended | 12 Months Ended | 12 Months Ended | 3 Months Ended | 12 Months Ended | 3 Months Ended | 12 Months Ended | 12 Months Ended | 3 Months Ended | 3 Months Ended | 3 Months Ended | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Dec. 31, 2011
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Sep. 30, 2011
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Jun. 30, 2011
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Mar. 31, 2011
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Dec. 31, 2010
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Sep. 30, 2010
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Mar. 31, 2010
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Dec. 31, 2011
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Dec. 31, 2010
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Dec. 31, 2009
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Apr. 30, 2011
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Dec. 31, 2011
$1.0 billion Revolver due 2012 [Member]
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Apr. 30, 2011
$1.0 billion Revolver due 2012 [Member]
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Dec. 31, 2010
$1.0 billion Revolver due 2012 [Member]
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Dec. 31, 2011
Long term debt, senior note matured on August 2011 [Member]
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Dec. 31, 2010
Long term debt, senior note matured on August 2011 [Member]
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Dec. 31, 2011
Long term debt, senior note matured on June 2017 [Member]
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Dec. 31, 2010
Long term debt, senior note matured on June 2017 [Member]
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Mar. 31, 2010
Long term debt, senior note matured on March 2040 [Member]
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Dec. 31, 2011
Long term debt, senior note matured on March 2040 [Member]
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Dec. 31, 2010
Long term debt, senior note matured on March 2040 [Member]
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Dec. 31, 2011
Long term debt, senior note matured on September 2019 [Member]
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Dec. 31, 2010
Long term debt, senior note matured on September 2019 [Member]
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Dec. 31, 2011
Long term debt, senior note matured on March 2035 [Member]
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Dec. 31, 2010
Long term debt, senior note matured on March 2035 [Member]
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Jun. 30, 2011
Long term debt, senior note matured on May 2018 [Member]
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Dec. 31, 2011
Long term debt, senior note matured on May 2018 [Member]
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Dec. 31, 2010
Long term debt, senior note matured on May 2018 [Member]
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Jun. 30, 2011
Senior notes, fixed interest rate of 4.750%, due 2023 [Member]
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Dec. 31, 2011
Senior notes, fixed interest rate of 4.750%, due 2023 [Member]
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Jun. 30, 2011
Senior notes, fixed interest rate of 5.700%, due 2041 [Member]
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Dec. 31, 2011
Senior notes, fixed interest rate of 5.700%, due 2041 [Member]
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Jun. 30, 2011
Long term debt, senior note matured on May 2023 [Member]
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Dec. 31, 2011
Long term debt, senior note matured on May 2023 [Member]
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Dec. 31, 2010
Long term debt, senior note matured on May 2023 [Member]
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Jun. 30, 2011
Debentures, fixed interest rate of 7.400%, due September 2035 [Member]
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Dec. 31, 2011
Debentures, fixed interest rate of 7.400%, due September 2035 [Member]
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Dec. 31, 2010
Debentures, fixed interest rate of 7.400%, due September 2035 [Member]
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Dec. 31, 2011
Long term debt, senior note matured on May 2041 [Member]
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Dec. 31, 2010
Long term debt, senior note matured on May 2041 [Member]
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Dec. 31, 2011
Tax-exempt bonds and other tax-exempt financings; maturities ranging from 2012 to 2035 [Member]
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Dec. 31, 2010
Tax-exempt bonds and other tax-exempt financings; maturities ranging from 2012 to 2035 [Member]
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Dec. 31, 2010
Senior Notes and Debenture [Member]
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Dec. 31, 2011
Senior Notes and Debenture [Member]
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Dec. 31, 2011
Other debt unsecured and secured by real property, equipment and other assets; interest rate maturing ranging from 2012 to 2042 [Member]
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Dec. 31, 2010
Other debt unsecured and secured by real property, equipment and other assets; interest rate maturing ranging from 2012 to 2042 [Member]
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Dec. 31, 2011
Long term debt, senior note matured on November 2021 [Member]
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Dec. 31, 2010
Long term debt, senior note matured on November 2021 [Member]
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Dec. 31, 2011
Eurodollar Rate borrowings [Member]
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Dec. 31, 2010
Eurodollar Rate borrowings [Member]
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Dec. 31, 2011
Long term debt, senior note matured on February 2011 [Member]
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Mar. 31, 2011
Long term debt, senior note matured on February 2011 [Member]
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Dec. 31, 2010
Long term debt, senior note matured on February 2011 [Member]
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Dec. 31, 2011
Long term debt, credit facility matured on September 2013 [Member]
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Dec. 31, 2010
Long term debt, credit facility matured on September 2013 [Member]
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Dec. 31, 2011
Long term debt, senior note matured on April 2011 [Member]
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Jun. 30, 2011
Long term debt, senior note matured on April 2011 [Member]
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Dec. 31, 2010
Long term debt, senior note matured on April 2011 [Member]
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Mar. 31, 2010
Long term debt, senior note matured on March 2020 [Member]
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Dec. 31, 2011
Long term debt, senior note matured on March 2020 [Member]
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Dec. 31, 2010
Long term debt, senior note matured on March 2020 [Member]
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Nov. 30, 2010
Long term debt, senior note matured on March 2020 [Member]
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Dec. 31, 2011
Ineffective portion of Interest rate lock settlements [Member]
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Dec. 31, 2011
Debentures [Member]
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Dec. 31, 2010
$425.0 million 6.125% senior notes due February 2014 [Member]
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Dec. 31, 2011
$425.0 million 6.125% senior notes due February 2014 [Member]
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Dec. 31, 2010
$600.0 million 7.250% senior notes due March 2015 [Member]
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Dec. 31, 2011
$600.0 million 7.250% senior notes due March 2015 [Member]
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Jun. 30, 2011
Long term debt, debentures matured on May 2021 [Member]
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Dec. 31, 2011
Long term debt, debentures matured on May 2021 [Member]
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Dec. 31, 2010
Long term debt, debentures matured on May 2021 [Member]
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Dec. 31, 2011
Long term debt, debentures matured on September 2035 [Member]
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Dec. 31, 2010
Long term debt, debentures matured on September 2035 [Member]
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Jun. 30, 2011
Long term debt, senior note matured on May 2016 [Member]
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Dec. 31, 2011
Long term debt, senior note matured on May 2016 [Member]
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Dec. 31, 2010
Long term debt, senior note matured on May 2016 [Member]
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Dec. 31, 2011
Fixed Rate Senior Notes [Member]
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Dec. 31, 2010
Fixed Rate Senior Notes [Member]
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Dec. 31, 2011
Credit Facilities [Member]
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Dec. 31, 2010
Credit Facilities [Member]
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Jun. 30, 2011
Revolving Credit Facility [Member]
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| Debt Instrument [Line Items] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Revolving credit facility maximum borrowing capacity | $ 1,250,000,000 | $ 1,000,000,000 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Total Debt | 0 | 663,900,000 | 0 | 645,800,000 | 0 | 249,800,000 | 0 | 267,600,000 | 0 | 600,000,000 | 0 | 93,400,000 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Principal amount outstanding | 1,126,400,000 | 1,151,800,000 | 425,000,000 | 600,000,000 | 275,700,000 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Interest rate, minimum | 0.06% | 5.00% | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Interest rate, maximum | 8.25% | 11.90% | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Debt | 6,921,800,000 | 6,743,600,000 | 6,921,800,000 | 6,743,600,000 | 17,200,000 | 0 | 0 | 392,000,000 | 674,200,000 | 663,900,000 | 649,500,000 | 649,500,000 | 646,200,000 | 645,800,000 | 250,200,000 | 249,800,000 | 699,800,000 | 0 | 548,600,000 | 0 | 596,600,000 | 0 | 1,126,400,000 | 1,151,800,000 | 89,400,000 | 92,600,000 | 600,000,000 | 600,000,000 | 34,400,000 | 75,000,000 | 0 | 261,700,000 | 17,200,000 | 50,000,000 | 0 | 215,100,000 | 849,900,000 | 849,900,000 | 33,300,000 | 93,400,000 | 123,300,000 | 267,600,000 | 0 | 535,500,000 | |||||||||||||||||||||||||||||||||||||
| Letters of credit utilizing availability under our credit facilities | 950,200,000 | 1,037,500,000 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Loss on extinguishment of debt | 3,500,000 | 6,000,000 | 199,500,000 | 1,800,000 | (9,100,000) | (19,400,000) | (132,300,000) | 210,800,000 | 160,800,000 | 134,100,000 | (132,100,000) | 0 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Repayment of principal due | 387,000,000 | 262,900,000 | 216,900,000 | 221,600,000 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Issuance of senior notes | 650,000,000 | 700,000,000 | 700,000,000 | 550,000,000 | 550,000,000 | 600,000,000 | 850,000,000 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Fair value of our fixed rate senior notes | 6,300,000,000 | 6,000,000,000 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Value of fixed rate senior notes | 5,700,000,000 | 5,400,000,000 | 5,700,000,000 | 5,400,000,000 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Unamortized adjustment to fair value rate tax exempt | 15,800,000 | 21,900,000 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Interest rate swap agreements | 0 | 5,200,000 | 0 | 5,200,000 | 5,200,000 | 0 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Accumulated and other comprehensive income, net of tax | 3,700,000 | 21,200,000 | 6,400,000 | 36,200,000 | 0 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Accumulated and other comprehensive income | 0 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| 5.700% senior notes due 2041 | 600,000,000 | 180,700,000 | 59,200,000 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Unamortized Discount of Senior Notes | 95,600,000 | 0 | 500,000 | 0 | 4,200,000 | 0 | 25,800,000 | 0 | 92,400,000 | 100,000 | 6,100,000 | 6,400,000 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Redemption of debt | 433,700,000 | 621,800,000 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Premium on redemption of debt | 102.042% | 103.625% | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Net proceeds from senior notes | 81,600,000 | 221,800,000 | 621,400,000 | 619,000,000 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Tax effect of Accumulated OCI related to derivatives | 0 | 0 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Debt instrument, interest rate, stated percentage | 6.75% | 6.875% | 6.20% | 5.50% | 6.086% | 3.80% | 4.75% | 5.70% | 4.75% | 5.70% | 5.25% | 5.75% | 6.375% | 5.00% | 6.125% | 7.25% | 9.25% | 7.40% | 7.125% | 3.25% | 1.56% | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Principal amount of debt | $ 7,092,200,000 | $ 7,048,400,000 | $ 7,092,200,000 | $ 7,048,400,000 | $ 17,200,000 | $ 0 | $ 0 | $ 392,200,000 | $ 750,000,000 | $ 750,000,000 | $ 650,000,000 | $ 650,000,000 | $ 650,000,000 | $ 650,000,000 | $ 275,700,000 | $ 275,600,000 | $ 700,000,000 | $ 0 | $ 550,000,000 | $ 0 | $ 600,000,000 | $ 0 | $ 1,142,200,000 | $ 1,173,700,000 | $ 89,400,000 | $ 92,600,000 | $ 600,000,000 | $ 600,000,000 | $ 0 | $ 262,900,000 | $ 17,200,000 | $ 50,000,000 | $ 0 | $ 216,900,000 | $ 850,000,000 | $ 850,000,000 | $ 425,000,000 | $ 600,000,000 | $ 35,300,000 | $ 99,500,000 | $ 165,200,000 | $ 360,000,000 | $ 0 | $ 600,000,000 | |||||||||||||||||||||||||||||||||||||