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Retirement Benefit Plan (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Compensation and Retirement Disclosure [Abstract]      
Employer match of employee contributions of first 1% of eligible compensation (as a percent) 100.00%    
Percentage of eligible compensation, matched 100% by employer 1.00%    
Employer match of employee contributions of next 5% of eligible compensation (as a percent) 50.00%    
Percentage of eligible compensation, matched 50% by employer 5.00%    
Recognized matching contributions from retirement benefit plans (in dollars) $ 4.2 $ 5.0 $ 4.2