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Stock Compensation (Details)
$ / shares in Units, $ in Millions
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2018
USD ($)
trading_day
$ / shares
shares
Jul. 01, 2017
USD ($)
Jun. 30, 2018
USD ($)
$ / shares
shares
Jul. 01, 2017
USD ($)
Dec. 30, 2017
USD ($)
$ / shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Stock based compensation expense | $ $ 3.8 $ 0.7 $ 13.0 $ 1.5  
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]          
Stock price (in dollars per share) | $ / shares $ 37.44   $ 37.44   $ 9.76
Expected volatility 65.04%       33.80%
Risk-free interest rate 1.73%       1.55%
Expected term (in years) 0 days       16 days
Stock Appreciation Rights (SARs)          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Weighted average exercise price, trading day average | trading_day 20        
Weighted average exercise price (in dollars per share) | $ / shares $ 7.00        
Options outstanding (in shares) | shares 445,000   445,000    
Deferred compensation liability | $ $ 13.3   $ 13.3   $ 1.0
Payable within thirty days of the vesting date | Stock Appreciation Rights (SARs)          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Vesting period     30 days    
Payable within one year of vesting date | Stock Appreciation Rights (SARs)          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Vesting period     1 year