Debt (Details Textual) (USD $)
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1 Months Ended | 3 Months Ended | 12 Months Ended | 1 Months Ended | 12 Months Ended | 1 Months Ended | 12 Months Ended | 1 Months Ended | 12 Months Ended | 12 Months Ended | 12 Months Ended | 1 Months Ended | 1 Months Ended | 1 Months Ended | 12 Months Ended | 1 Months Ended | 12 Months Ended | ||||||||||||||||||||||||||||||||||||||||
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May 31, 2012
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Jun. 30, 2012
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Jun. 30, 2011
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Dec. 31, 2013
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Dec. 31, 2012
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Dec. 31, 2011
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Dec. 31, 2013
Interest Rate Swap [Member]
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Aug. 31, 2011
Interest Rate Swap [Member]
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Jun. 30, 2012
Interest Rate Locks [Member]
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Dec. 31, 2012
Credit Facilities [Member]
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May 31, 2011
Revolving Credit Facility [Member]
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Dec. 31, 2013
Minimum [Member]
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Dec. 31, 2013
Maximum [Member]
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Dec. 31, 2013
Credit facilities due May 2017 [Member]
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Dec. 31, 2012
Credit facilities due May 2017 [Member]
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May 31, 2012
Credit facilities due May 2017 [Member]
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May 31, 2011
$99.5 million 9.250% debentures due May 2021 [Member]
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Dec. 31, 2011
$99.5 million 9.250% debentures due May 2021 [Member]
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Dec. 31, 2013
$99.5 million 9.250% debentures due May 2021 [Member]
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Dec. 31, 2012
$99.5 million 9.250% debentures due May 2021 [Member]
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May 31, 2011
$360.0 million 7.400% debentures due September 2035 [Member]
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Dec. 31, 2011
$360.0 million 7.400% debentures due September 2035 [Member]
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Dec. 31, 2013
$360.0 million 7.400% debentures due September 2035 [Member]
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Dec. 31, 2012
$360.0 million 7.400% debentures due September 2035 [Member]
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Dec. 31, 2013
$1.0 billion revolver due 2012 [Member]
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Dec. 31, 2012
$1.0 billion revolver due 2012 [Member]
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Dec. 31, 2013
Uncommitted revolver [Member]
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Dec. 31, 2012
Uncommitted revolver [Member]
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Mar. 31, 2012
Uncommitted revolver, original borrowing capacity [Member]
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Jul. 31, 2012
Uncommitted revolver, amended borrowing capacity [Member]
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Dec. 31, 2013
$850.0 million 3.550% senior notes due June 2022 [Member]
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Dec. 31, 2012
$850.0 million 3.550% senior notes due June 2022 [Member]
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Jun. 30, 2012
$850.0 million 3.550% senior notes due June 2022 [Member]
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Dec. 31, 2012
$750.0 million 6.875% senior notes due June 2017 [Member]
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Dec. 31, 2013
$750.0 million 6.875% senior notes due June 2017 [Member]
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Aug. 31, 2011
6.750% senior notes due August 2011 [Member]
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May 31, 2011
$700.0 million 3.800% senior notes due May 2018 [Member]
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Dec. 31, 2013
$700.0 million 3.800% senior notes due May 2018 [Member]
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Dec. 31, 2012
$700.0 million 3.800% senior notes due May 2018 [Member]
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May 31, 2011
$600.0 million 5.700% senior notes due 2041 [Member]
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Dec. 31, 2013
$600.0 million 5.700% senior notes due 2041 [Member]
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May 31, 2011
$600.0 million 7.125% senior notes due May 2016 [Member]
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Dec. 31, 2011
$600.0 million 7.125% senior notes due May 2016 [Member]
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Dec. 31, 2013
$600.0 million 7.125% senior notes due May 2016 [Member]
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May 31, 2011
$550.0 million 4.750% senior notes May 2023 [Member]
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Dec. 31, 2013
$550.0 million 4.750% senior notes May 2023 [Member]
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Dec. 31, 2012
$550.0 million 4.750% senior notes May 2023 [Member]
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May 31, 2011
6.375% senior notes due May 2011 [Member]
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Feb. 28, 2011
5.750% senior notes matured [Member]
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Dec. 31, 2013
5.00% senior notes due March 2020 [Member]
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Dec. 31, 2012
5.00% senior notes due March 2020 [Member]
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Dec. 31, 2013
6.20% senior notes due March 2040 [Member]
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Dec. 31, 2012
6.20% senior notes due March 2040 [Member]
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Dec. 31, 2013
Tax-exempt financings [Member]
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Dec. 31, 2012
Tax-exempt financings [Member]
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Dec. 31, 2011
Tax-exempt financings [Member]
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Dec. 31, 2012
Senior notes: 2011 Notes [Member]
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Credit Facilities: | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Revolving credit facility maximum borrowing capacity | $ 1,250,000,000.00 | $ 75,000,000.0 | $ 125,000,000.0 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
Aggregate amount under Amended and Restated Credit Facility | 500,000,000 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Reduced amount of existing credit facility | 1,000,000,000.0 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Interest rate | 1.32% | 9.25% | 9.25% | 7.40% | 7.40% | 1.35% | 3.55% | 3.55% | 6.875% | 6.875% | 6.75% | 3.80% | 5.70% | 7.125% | 7.125% | 4.75% | 6.375% | 5.75% | 5.00% | 6.20% | |||||||||||||||||||||||||||||||||||||
Amount of borrowings outstanding | 7,099,900,000 | 7,150,200,000 | 0 | 0 | 35,300,000 | 35,300,000 | 165,200,000 | 165,200,000 | 0 | 25,000,000 | 0 | 13,900,000 | 850,000,000 | 850,000,000 | 700,000,000 | 700,000,000 | 550,000,000 | 550,000,000 | 850,000,000 | 850,000,000 | 650,000,000 | 650,000,000 | 1,087,700,000 | 1,097,900,000 | |||||||||||||||||||||||||||||||||
Letters of credit utilizing availability under our credit facilities | 722,100,000 | 909,400,000 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||
Balance availability under Letters of Credit Facilities | 1,527,900,000 | 1,315,600,000 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||
Senior Notes and Debentures: | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Debt instrument, face amount | 99,500,000.0 | 360,000,000.0 | 850,000,000.0 | 750,000,000.0 | 600,000,000.0 | 600,000,000.0 | |||||||||||||||||||||||||||||||||||||||||||||||||||
Interest rate | 1.32% | 9.25% | 9.25% | 7.40% | 7.40% | 1.35% | 3.55% | 3.55% | 6.875% | 6.875% | 6.75% | 3.80% | 5.70% | 7.125% | 7.125% | 4.75% | 6.375% | 5.75% | 5.00% | 6.20% | |||||||||||||||||||||||||||||||||||||
Redemption of senior notes, face amount | 64,200,000 | 194,800,000 | 750,000,000 | 600,000,000 | 189,100,000 | 94,000,000 | 30,000,000 | ||||||||||||||||||||||||||||||||||||||||||||||||||
Notes payable | 387,000,000 | 216,900,000 | 262,900,000 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
Debt instrument, increase, additional borrowings | 700,000,000.0 | 600,000,000.0 | 550,000,000.0 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
Proceeds from notes payable | 619,000,000 | 221,800,000 | 621,400,000 | 81,600,000 | |||||||||||||||||||||||||||||||||||||||||||||||||||||
Debt instrument, periodic payment, principal | 59,200,000 | 180,700,000 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||
Tax-Exempt Financings: | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Long-term debt | 7,018,100,000 | 7,070,500,000 | 0 | 0 | 33,600,000 | 33,400,000 | 124,200,000 | 123,800,000 | 0 | 25,000,000 | 0 | 13,900,000 | 848,000,000 | 847,800,000 | 699,900,000 | 699,800,000 | 544,300,000 | 548,700,000 | 849,900,000 | 849,900,000 | 649,500,000 | 649,500,000 | 1,087,700,000 | 1,097,500,000 | |||||||||||||||||||||||||||||||||
Tax-exempt financings maturity period | 2014 | 2038 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||
Percentage of tax exempt financings | 85.00% | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Restricted Cash and Investments, Noncurrent | 169,700,000 | 164,200,000 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||
Restricted financing proceeds | 21,900,000 | 24,700,000 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||
Other Debt: | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Capital lease liabilities | 85,900,000 | 87,000,000 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||
Range of capital lease liabilities maturity period | 2014 | 2046 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||
Interest Paid: | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Interest paid | 324,000,000 | 341,000,000 | 396,200,000 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
Interest Rate Swap and Lock Agreements: | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Reduction to interest expense due to periodic settlements of active swap agreements | 5,400,000 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Derivative, Notional Amount | 725,000,000 | 300,000,000.0 | 210,000,000 | 200,000,000 | |||||||||||||||||||||||||||||||||||||||||||||||||||||
Interest rate swap at fair value | 4,400,000 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Net interest income related to swap settlements | 2,000,000 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Gain on the change in fair value of the hedged senior notes | 4,500,000 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Loss on the related interest rate swaps | 4,400,000 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Interest at fixed rates | 6.75% | 2.20% | |||||||||||||||||||||||||||||||||||||||||||||||||||||||
Amount of interest rate locks terminated and paid | 4,800,000 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Effective portion of interest rate locks recorded to accumulated other comprehensive income, before tax | 4,700,000 | 36,200,000 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||
Effective portion of interest rate locks recorded to accumulated other comprehensive income, net of tax | 23,000,000 | 24,600,000 | 2,700,000 | 21,200,000 | |||||||||||||||||||||||||||||||||||||||||||||||||||||
Derivative fixed interest rate, minimum | 3.10% | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Derivative fixed interest rate, maximum | 4.61% | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Amount paid to counterparties, interest rate locks | 36,500,000 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Expected to amortization over next twelve months, yield adjustment | 2,600,000 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Effective portion of interest rate locks amortized as an adjustment to interest expense | $ 2,700,000 | $ 2,200,000 | $ 1,400,000 |