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Debt (Narrative) (Details) - USD ($)
3 Months Ended 12 Months Ended
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Jul. 29, 2016
Jan. 19, 2016
Sep. 08, 2014
Jul. 23, 2014
Debt Instrument                  
Long-term debt, maturities, repayments of principal, 2016     $ 465,200,000            
Long-term debt, maturities, repayments of principal, 2017     123,000,000            
Long-term debt, maturities, repayments of principal, 2018 - 2020     0            
Long-term debt, maturities, repayments of principal, thereafter     1,000,000,000            
Extinguishment of debt, amount     238,000,000 $ 245,700,000 $ 461,400,000        
Loss on debt retirements     0 8,584,000 $ 26,930,000        
Letters of credit outstanding, amount     191,300,000 212,100,000          
Unused credit lines     308,700,000 291,600,000          
Term loan     $ 500,000,000            
Line of Credit Facility, Interest Rate Description     0.015            
Notes Payable     $ 35,336,000 22,255,000          
Debt Instrument, Term     6 years            
Financial Services debt     $ 267,877,000 $ 140,241,000          
Maximum [Member]                  
Debt Instrument                  
Debt instrument, interest rate, stated percentage     5.00%            
Unsecured Letter Of Credit Facility [Member]                  
Debt Instrument                  
Letters of credit outstanding, amount     $ 191,300,000            
Revolving Credit Facility [Member]                  
Debt Instrument                  
Maximum borrowing capacity                 $ 500,000,000
Short-term Debt, Terms       0.5          
Short-term debt covenant description       300000          
Line of Credit, Current     $ 0            
Line of Credit Facility, Initiation Date     Jul. 23, 2014            
Line of Credit Facility, Expiration Date     Jul. 21, 2017            
Revolving Credit Facility Accordion Feature [Member]                  
Debt Instrument                  
Maximum borrowing capacity                 $ 1,000,000,000.0
Financial Services [Member]                  
Debt Instrument                  
Maximum borrowing capacity     $ 310,000,000 $ 150,000,000          
Unused credit lines     $ 42,123,000 9,759,000          
Financial Services [Member] | Unsecured Letter Of Credit Facility [Member]                  
Debt Instrument                  
Line of Credit Facility, Expiration Date     Sep. 01, 2014            
Financial Services [Member] | Repurchase Agreement [Member]                  
Debt Instrument                  
Maximum borrowing capacity               $ 310,000,000  
Line of Credit Facility, Initiation Date Jun. 01, 2015 Feb. 02, 2015 Sep. 08, 2014            
Line of Credit Facility, Expiration Date     Sep. 07, 2015            
Financial Services debt     $ 267,900,000 $ 140,200,000          
Financial Services [Member] | Repurchase Agreement [Member] | Scenario, Forecast [Member]                  
Debt Instrument                  
Maximum borrowing capacity           $ 200,000,000      
Subsequent Event [Member] | Financial Services [Member] | Repurchase Agreement [Member]                  
Debt Instrument                  
Maximum borrowing capacity             $ 175,000,000