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Debt (Narrative) (Details) - USD ($)
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Jul. 29, 2016
Jan. 19, 2016
Dec. 31, 2015
Dec. 01, 2015
Debt Instrument [Line Items]            
Letters of credit outstanding $ 213,400,000       $ 191,300,000  
Notes payable $ 36,300,000       35,300,000  
Debt Instrument, term 6 years          
Amount outstanding $ 118,614,000       267,877,000  
Revolving Credit Facility            
Debt Instrument [Line Items]            
Current borrowing capacity $ 500,000,000          
Maximum percent of current credit facility that may be issued in addition 50.00%          
Maximum additional issuance $ 300,000,000          
Fair value of amount outstanding 0          
Revolving Credit Facility Accordion Feature            
Debt Instrument [Line Items]            
Maximum borrowing capacity $ 1,000,000,000          
Repurchase Agreement | Financial Services            
Debt Instrument [Line Items]            
Maximum borrowing capacity       $ 175,000,000.0   $ 310,000,000
Line of Credit Facility, Initiation Date Jun. 01, 2015 Sep. 04, 2015        
Line of Credit Facility, Expiration Date Sep. 02, 2016          
Amount outstanding $ 118,600,000       $ 267,900,000  
Maximum            
Debt Instrument [Line Items]            
Stated interest rate 5.00%          
Senior Unsecured Term Loan Maturing January 3, 2017 [Member] | Senior Loans [Member]            
Debt Instrument [Line Items]            
Debt Instrument, Face Amount $ 500,000,000.0          
Scenario, Forecast [Member] | Repurchase Agreement | Financial Services            
Debt Instrument [Line Items]            
Maximum borrowing capacity     $ 200,000,000.0