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Retirement Plans - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2016
Jun. 30, 2016
Jun. 28, 2015
Dec. 31, 2015
Retirement Plans        
Defined Benefit Plan Disclosure [Line Items]        
Net pension plan obligation $ 183.6 $ 183.6    
Assumptions used calculating net periodic benefit cost, expected long-term return on assets (as a percent)   7.00%   8.00%
Incremental costs due to change in assumption $ 1.4 $ 2.8    
SERP        
Defined Benefit Plan Disclosure [Line Items]        
Contributions to plan   $ 3.3 $ 5.6