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Debt (Details Textual) (USD $)
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
May 31, 2012
Jun. 30, 2012
Jun. 30, 2011
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2013
Interest Rate Swap [Member]
Aug. 31, 2011
Interest Rate Swap [Member]
Jun. 30, 2012
Interest Rate Locks [Member]
Dec. 31, 2012
Credit Facilities [Member]
May 31, 2011
Revolving Credit Facility [Member]
Dec. 31, 2013
Minimum [Member]
Dec. 31, 2013
Maximum [Member]
Dec. 31, 2013
Credit facilities due May 2017 [Member]
Dec. 31, 2012
Credit facilities due May 2017 [Member]
May 31, 2012
Credit facilities due May 2017 [Member]
May 31, 2011
$99.5 million 9.250% debentures due May 2021 [Member]
Dec. 31, 2011
$99.5 million 9.250% debentures due May 2021 [Member]
Dec. 31, 2013
$99.5 million 9.250% debentures due May 2021 [Member]
Dec. 31, 2012
$99.5 million 9.250% debentures due May 2021 [Member]
May 31, 2011
$360.0 million 7.400% debentures due September 2035 [Member]
Dec. 31, 2011
$360.0 million 7.400% debentures due September 2035 [Member]
Dec. 31, 2013
$360.0 million 7.400% debentures due September 2035 [Member]
Dec. 31, 2012
$360.0 million 7.400% debentures due September 2035 [Member]
Dec. 31, 2013
$1.0 billion revolver due 2012 [Member]
Dec. 31, 2012
$1.0 billion revolver due 2012 [Member]
Dec. 31, 2013
Uncommitted revolver [Member]
Dec. 31, 2012
Uncommitted revolver [Member]
Mar. 31, 2012
Uncommitted revolver, original borrowing capacity [Member]
Jul. 31, 2012
Uncommitted revolver, amended borrowing capacity [Member]
Dec. 31, 2013
$850.0 million 3.550% senior notes due June 2022 [Member]
Dec. 31, 2012
$850.0 million 3.550% senior notes due June 2022 [Member]
Jun. 30, 2012
$850.0 million 3.550% senior notes due June 2022 [Member]
Dec. 31, 2012
$750.0 million 6.875% senior notes due June 2017 [Member]
Dec. 31, 2013
$750.0 million 6.875% senior notes due June 2017 [Member]
Aug. 31, 2011
6.750% senior notes due August 2011 [Member]
May 31, 2011
$700.0 million 3.800% senior notes due May 2018 [Member]
Dec. 31, 2013
$700.0 million 3.800% senior notes due May 2018 [Member]
Dec. 31, 2012
$700.0 million 3.800% senior notes due May 2018 [Member]
May 31, 2011
$600.0 million 5.700% senior notes due 2041 [Member]
Dec. 31, 2013
$600.0 million 5.700% senior notes due 2041 [Member]
May 31, 2011
$600.0 million 7.125% senior notes due May 2016 [Member]
Dec. 31, 2011
$600.0 million 7.125% senior notes due May 2016 [Member]
Dec. 31, 2013
$600.0 million 7.125% senior notes due May 2016 [Member]
May 31, 2011
$550.0 million 4.750% senior notes May 2023 [Member]
Dec. 31, 2013
$550.0 million 4.750% senior notes May 2023 [Member]
Dec. 31, 2012
$550.0 million 4.750% senior notes May 2023 [Member]
May 31, 2011
6.375% senior notes due May 2011 [Member]
Feb. 28, 2011
5.750% senior notes matured [Member]
Dec. 31, 2013
5.00% senior notes due March 2020 [Member]
Dec. 31, 2012
5.00% senior notes due March 2020 [Member]
Dec. 31, 2013
6.20% senior notes due March 2040 [Member]
Dec. 31, 2012
6.20% senior notes due March 2040 [Member]
Dec. 31, 2013
Tax-exempt financings [Member]
Dec. 31, 2012
Tax-exempt financings [Member]
Dec. 31, 2011
Tax-exempt financings [Member]
Dec. 31, 2012
Senior notes: 2011 Notes [Member]
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