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Shareholders' Equity (Narrative) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Feb. 24, 2020
Dec. 31, 2018
May 20, 2010
Dec. 31, 2007
Class of Stock [Line Items]          
Common stock - Class A, shares authorized 400,000,000   400,000,000    
Common stock - Class A, shares issued 111,775,000   112,433,000    
Federal net operating loss carry-forward $ 754.8        
Class A Common Stock [Member] | November 16, 2007 Registration Statement [Member]          
Class of Stock [Line Items]          
Common stock - Class A, shares authorized         4,000,000.0
Common stock - Class A, shares issued 10,000   487,963    
Shares reclassified as authorized and unissued 1,200,000        
Class A Common Stock [Member] | March 5, 2018 Registration Statement [Member]          
Class of Stock [Line Items]          
Securities issued 0   0    
Stock Repurchase Program Four [Member] | Class A Common Stock [Member] | Subsequent Event [Member]          
Class of Stock [Line Items]          
Stock repurchase program, remaining authorization   $ 624.3      
2010 Plan [Member] | Class A Common Stock [Member]          
Class of Stock [Line Items]          
Maximum issuance of shares 15,000,000.0     15,000,000.0  
Real Estate Investment Trust [Member]          
Class of Stock [Line Items]          
Federal net operating loss carry-forward $ 652.9