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Equity (Details) (USD $)
In Millions, except Share data, unless otherwise specified
 1 Months Ended 3 Months Ended 12 Months Ended
Mar. 31, 2007
Right
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2011
Dec. 31, 2013
D
Mar. 21, 2007
Equity [Abstract]                        
Authorized capitalization of common stock (in shares)   300,000,000       300,000,000         300,000,000  
Par value of common stock (in dollars per share)   $ 0.01                 $ 0.01 $ 0.01
Authorized capitalization of preferred stock (in shares)   3,500,000                 3,500,000  
Par value of preferred stock per share (in dollars per share)   $ 0.01                 $ 0.01  
Number of rights per common stock share distributed as dividends 1                      
Number of shares of common stock the registered holder of each right is entitled to purchase when exercisable (in shares)   1                 1  
Purchase price of each common stock share following the exercise of rights (in dollars per share)   110.00                 110.00  
Rights exercisable after public announcement of an acquisition or right to acquire 20% or more of outstanding common stock shares (in number of days)                     10  
Beneficial ownership by a person or group of affiliated persons before rights become exercisable (as a percent)                     20.00%  
Rights exercisable after tender offer or exchange offer to acquire 20% or more of entity's outstanding common stock shares (in number of days)                     10  
Dividends per common share (in dollars per share)   $ 0.08 $ 0.00 $ 0.00 $ 0.00 $ 0.08 $ 0.00 $ 0.00 $ 0.00 $ 0.08    
Number of shares authorized to be repurchased (in shares)   10,000,000                 10,000,000  
Aggregate number of shares repurchased (in shares)                     7,600,000  
Aggregate cost of shares repurchased                     $ 49.8