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Incentive and Deferred Compensation Plans (Details) - USD ($)
$ in Millions
1 Months Ended 12 Months Ended
Jul. 31, 2013
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Final Payments Under Existing Cash Bonus Program        
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]        
Payments to employees $ 10.9      
Annual Incentive Plan        
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]        
Accrued bonuses   $ 21.6 $ 21.1  
Minimum | Management Annual Incentive Plan        
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]        
Incentive plans, payout percentages of target values   0.00%    
Maximum | Management Annual Incentive Plan        
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]        
Incentive plans, payout percentages of target values   200.00%    
Deferred Compensation Plans        
Defined Contribution Plan Disclosure [Line Items]        
Retirement plan, employer matching contribution, percent of match   100.00% 100.00% 100.00%
Retirement plan, employer matching contribution, percent of employees' gross pay (up to)   10.00% 10.00% 15.00%
Retirement plan, cost recognized   $ 7.9 $ 8.7 $ 11.0
Deferred compensation plan, employer match percentage (up to)   10.00% 10.00% 15.00%
Deferred compensation plan, compensation expense   $ 2.9 $ 2.0 $ 2.7