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Pension and Other Post-Retirement Plans - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Sep. 30, 2014
Dec. 31, 2015
Dec. 31, 2014
Sep. 30, 2013
Defined benefit pension plans        
Defined Benefit Plan Disclosure [Line Items]        
Estimated contributions in the next fiscal year   $ 2.9    
Accumulated benefit obligation   115.0 $ 124.9  
Underfunded status of plan   $ 10.5 $ 20.2  
U.K. Plan        
Defined Benefit Plan Disclosure [Line Items]        
Decrease in benefit obligation due to plan amendment $ 5.8      
Maximum increase in pensionable earnings 2.00%      
Funded percentage (less than 100%)       100.00%
Global return fund | U.K. Plan        
Target allocations of plan assets        
Target allocation in debt securities (as a percent)   30.00%    
Long lease property | U.K. Plan        
Target allocations of plan assets        
Target allocation in debt securities (as a percent)   16.00%    
Corporate bonds | U.K. Plan        
Target allocations of plan assets        
Target allocation in debt securities (as a percent)   9.00%    
Corporate bonds | Canadian Plan        
Target allocations of plan assets        
Target allocation in debt securities (as a percent)   40.00%    
U.K | Equity securities | U.K. Plan        
Target allocations of plan assets        
Target allocation in debt securities (as a percent)   25.00%    
Canada | Equity securities | Canadian Plan        
Target allocations of plan assets        
Target allocation in debt securities (as a percent)   20.00%    
Other foreign countries | Equity securities | U.K. Plan        
Target allocations of plan assets        
Target allocation in debt securities (as a percent)   20.00%    
Other foreign countries | Equity securities | Canadian Plan        
Target allocations of plan assets        
Target allocation in debt securities (as a percent)   40.00%