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Debt (Debt Transactions Narrative) (Details) - USD ($)
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Dec. 31, 2016
Debt Instrument [Line Items]      
Fair value of company debt $ 1,100,000,000   $ 1,100,000,000
Gain (loss) on debt extinguishment (2,600,000) $ 14,100,000  
Long-term debt 1,078,000,000   1,104,500,000
Principal amount repurchased   116,600,000  
Revolving Credit Facility [Member]      
Debt Instrument [Line Items]      
Maximum borrowing capacity $ 725,000,000    
Term of debt instrument 4 years    
Long-term debt $ 3,600,000   19,000,000
Debt instrument 725,000,000    
Master Note and Security Agreement [Member]      
Debt Instrument [Line Items]      
Gain (loss) on debt extinguishment   (200,000)  
Long-term debt 149,200,000   152,600,000
Principal amount repurchased   60,100,000  
Senior Unsecured Notes [Member]      
Debt Instrument [Line Items]      
Gain (loss) on debt extinguishment   14,300,000  
Long-term debt 243,500,000   243,500,000
Principal amount repurchased   56,500,000  
Debt instrument $ 300,000,000 $ 300,000,000  
Interest rate, percentage   7.00%  
Term Loan A [Member]      
Debt Instrument [Line Items]      
Term of debt instrument 4 years    
Long-term debt $ 375,000,000   $ 376,900,000
Debt instrument $ 375,000,000    
Financing Agreement Senior Secured Credit Facility [Member] | London Interbank Offered Rate (LIBOR) [Member]      
Debt Instrument [Line Items]      
Basis spread on variable rate 2.00%    
Financing Agreement Senior Secured Credit Facility [Member] | Base Rate [Member]      
Debt Instrument [Line Items]      
Basis spread on variable rate 1.00%