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Retirement Plans - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Mar. 31, 2016
Mar. 29, 2015
Dec. 31, 2015
Retirement Plans      
Defined Benefit Plan Disclosure [Line Items]      
Net pension plan obligation $ 184.1    
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    
Expected incremental costs due to change in assumption, remainder of fiscal year 5.5    
SERP      
Defined Benefit Plan Disclosure [Line Items]      
Contributions to plan $ 2.4 $ 3.2