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Debt Gain (Loss) on Extinguishment of Debt (Details) - USD ($)
3 Months Ended 12 Months Ended
Sep. 30, 2016
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Extinguishment of Debt [Line Items]        
Principal amount   $ 7,748,500,000.0 $ 7,635,800,000.0  
Cash Paid in Loss on Extinguishment of Debt   178,400,000    
Non-cash Loss on Extinguishment of Debt   17,800,000    
Total Loss on Extinguishment of Debt $ (203,400,000) 196,200,000 $ 0 $ 1,400,000
Non-cash Interest Expense   7,200,000    
$275.7 million 6.09% senior notes due March 2035        
Extinguishment of Debt [Line Items]        
Principal amount   $ 275,700,000    
Interest rate   6.09%    
Repayments of long-term debt   $ 93,800,000    
Cash Paid in Loss on Extinguishment of Debt   26,100,000    
Non-cash Loss on Extinguishment of Debt   8,000,000    
Total Loss on Extinguishment of Debt   34,100,000    
Non-cash Interest Expense   (1,100,000)    
$165.2 million 7.40% debentures due September 2035        
Extinguishment of Debt [Line Items]        
Principal amount   $ 165,200,000    
Interest rate   7.40%    
Repayments of long-term debt   $ 17,200,000    
Cash Paid in Loss on Extinguishment of Debt   7,300,000    
Non-cash Loss on Extinguishment of Debt   4,100,000    
Total Loss on Extinguishment of Debt   11,400,000    
Non-cash Interest Expense   0    
$650.0 million 6.20% senior notes due March 2040        
Extinguishment of Debt [Line Items]        
Principal amount   $ 650,000,000    
Interest rate   6.20%    
Repayments of long-term debt   $ 250,100,000    
Cash Paid in Loss on Extinguishment of Debt   85,300,000    
Non-cash Loss on Extinguishment of Debt   2,600,000    
Total Loss on Extinguishment of Debt   87,900,000    
Non-cash Interest Expense   1,000,000    
$600.0 million 5.70% senior notes due May 2041        
Extinguishment of Debt [Line Items]        
Principal amount   $ 600,000,000    
Interest rate   5.70%    
Repayments of long-term debt   $ 214,300,000    
Cash Paid in Loss on Extinguishment of Debt   59,700,000    
Non-cash Loss on Extinguishment of Debt   3,100,000    
Total Loss on Extinguishment of Debt   62,800,000    
Non-cash Interest Expense   $ 7,300,000