v2.4.0.6

Debt (Details Textual) (USD $)	3 Months Ended	12 Months Ended
	Jun. 30, 2011	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009	Mar. 31, 2011	Mar. 31, 2010
Extinguishment of Debt [Line Items]
Principal amount of debt		$ 7,092,200,000	$ 7,048,400,000
Derivative [Line Items]
Notional value of swap agreements	725,000,000	0			725,000,000	500,000,000
Debt (Textual) [Abstract]
Aggregate amount under Amended and Restated Credit Facility		500,000,000
Non cash discount premiums and other fair value related adjustments		170,400,000
Interest Paid		396,200,000	417,800,000	471,600,000
Reduction in existing credit facility		1,250,000,000
Balance availability under Letters of Credit Facilities		1,515,400,000	1,637,500,000
Restricted cash		189,600,000
Proceeds from the issuance of tax-exempt bonds and other tax-exempt financings		22,500,000
Capital lease liabilities		88,300,000	91,800,000
Maximum fixed interest rate related to the interest rate derivative	3.10%				3.10%
Minimum fixed interest rate related to the interest rate derivative	4.61%				4.61%
Payment upon termination of Interest rate contract						7,000,000
Interest expense over the life of the issued debt		1,500,000				300,000
Amount of interest rate locks terminated	36,500,000
Amortization of Interest Cost		0
Percentage of tax-exempt financings		75.00%
Interest Rate Swap [Member]
Derivative [Line Items]
Interest at fixed rates		6.75%
Notional value of swap agreements		210,000,000
$350.0 million 6.500% senior notes due 2010 [Member]
Extinguishment of Debt [Line Items]
Debt instrument, interest rate, stated percentage		6.50%
5.700% senior notes due 2041				128,400,000
$400.0 million 5.750% senior notes due 2011 [Member]
Extinguishment of Debt [Line Items]
Debt instrument, interest rate, stated percentage		5.75%
5.700% senior notes due 2041				137,100,000
$275.0 million 6.375% senior notes due 2011 [Member]
Extinguishment of Debt [Line Items]
Debt instrument, interest rate, stated percentage		6.375%
5.700% senior notes due 2041				58,100,000
$450.0 million 6.750% senior notes due 2011 [Member]
Extinguishment of Debt [Line Items]
Debt instrument, interest rate, stated percentage		6.75%
5.700% senior notes due 2041				63,000,000
$450.0 million 7.875% senior notes due April 2013 [Member]
Extinguishment of Debt [Line Items]
5.700% senior notes due 2041				450,000,000
$400.0 million of 7.375% senior notes due 2014 [Member]
Extinguishment of Debt [Line Items]
Debt instrument, interest rate, stated percentage		5.75%		7.375%
5.700% senior notes due 2041				400,000,000
$230.0 million of 4.250% senior convertible note due 2034 [Member]
Extinguishment of Debt [Line Items]
5.700% senior notes due 2041				230,000,000
Repurchase of $5,000,000 of 6.375% Senior Notes due 2011 (Aug) [Member]
Extinguishment of Debt [Line Items]
Debt instrument, interest rate, stated percentage		6.375%
$425.0 million 6.125% senior notes due February 2014 [Member]
Extinguishment of Debt [Line Items]
5.700% senior notes due 2041			$ 425,000,000
Repurchase of $62,028,000 of 6.750% Senior Notes due 2011 [Member]
Extinguishment of Debt [Line Items]
Debt instrument, interest rate, stated percentage		6.75%

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