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Fair Value Measurements (Tables)
 6 Months Ended
Jun. 30, 2014
Fair Value Measurements  
Schedule of cash and cash equivalents and other investments reconciliation from adjusted cost to fair value

 

 

 
   June 30, 2014  
 
   Adjusted
Cost		   Unrealized
Gains		   Unrealized
Losses		   Fair Value  
 
   (in millions)
  

Cash

   $ 117.3   $ —   $ —   $ 117.3  

U.S. and Canadian government obligations

     2,051.8     —     —     2,051.8  

Other debt securities

     25.0     —     —     25.0  
                   
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Total cash and cash equivalents

   $ 2,194.1   $ —   $ —   $ 2,194.1  

Restricted cash

     645.0     —     —     645.0  


 

 
   December 31, 2013  
 
   Adjusted
Cost		   Unrealized
Gains		   Unrealized
Losses		   Fair Value  
 
   (in millions)
  

Cash

   $ 148.9   $ —   $ —   $ 148.9  

U.S. and Canadian government obligations

     1,491.1     —     —     1,491.1  

Other debt securities

     70.8     —     —     70.8  
                   
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Total cash and cash equivalents

   $ 1,710.8   $ —   $ —   $ 1,710.8  

Restricted cash

     154.0     —     —     154.0  

Asset retirement obligation funds

     203.7     —     —     203.7  
Schedule of assets and liabilities measured at fair value on a recurring basis

 

 

 
   June 30, 2014  
 
   Total Fair
Value		   Quoted Prices
in Active
Markets
(Level 1)		   Significant
Other
Observable
Inputs
(Level 2)		   Significant
Unobservable
Inputs
(Level 3)		  
 
   (in millions)
  

Cash and cash equivalents

   $ 2,194.1   $ 2,194.1   $ —   $ —  

Restricted cash

     645.0     645.0     —     —  

Unrealized gains on derivative instruments

     15.9     —     15.9     —  
                   
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Total assets at fair value

   $ 2,855.0   $ 2,839.1   $ 15.9   $ —  
                   
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
                   

Unrealized losses on derivative instruments

   $ 3.2   $ —   $ 3.2   $ —  
                   
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Total liabilities at fair value

   $ 3.2   $ —   $ 3.2   $ —  
                   
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
                   


 

 
   December 31, 2013  
 
   Total Fair
Value		   Quoted Prices
in Active
Markets
(Level 1)		   Significant
Other
Observable
Inputs
(Level 2)		   Significant
Unobservable
Inputs
(Level 3)		  
 
   (in millions)
  

Cash and cash equivalents

   $ 1,710.8   $ 1,710.8   $ —   $ —  

Restricted cash

     154.0     154.0     —     —  

Unrealized gains on derivative instruments

     74.3     —     74.3     —  

Asset retirement obligation funds

     203.7     203.7     —     —  
                   
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Total assets at fair value

   $ 2,142.8   $ 2,068.5   $ 74.3   $ —  
                   
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
                   

Unrealized losses on derivative instruments

   $ 0.2   $ —   $ 0.2   $ —  
                   
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Total liabilities at fair value

   $ 0.2   $ —   $ 0.2   $ —  
                   
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
                   
Schedule of carrying amounts and estimated fair values of financial instruments

 

 

 
   June 30, 2014   December 31, 2013  
 
   Carrying
Amount		   Fair Value   Carrying
Amount		   Fair Value  
 
   (in millions)
  

Long-term debt, including current portion

   $ 4,592.4   $ 5,012.4   $ 3,098.1   $ 3,276.7