Quarterly report pursuant to Section 13 or 15(d)

Share-Based Compensation (Details)

v3.10.0.1
Share-Based Compensation (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jul. 01, 2017
Jun. 30, 2018
Jul. 01, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of Shares Available for Grant (in Shares) 5,200,000   5,200,000  
Percentage of Premium Paid Out in Deferred Company Common Stock     20.00%  
Non-Vested Stock Awards [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of Performance Shares Granted (in Shares) 0 0 300,000 200,000
Share-Based Compensation Expense $ 3.4 $ 2.8 $ 5.9 $ 5.6
Unrecognized Compensation Cost 18.4   $ 18.4  
Unrecognized Compensation Cost, Period for Recognition     1 year 6 months  
Performance Shares [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-Based Compensation Expense 1.7 $ 1.8 $ 1.2 $ 3.1
Unrecognized Compensation Cost $ 6.8   $ 6.8  
Unrecognized Compensation Cost, Period for Recognition     1 year 3 months 18 days  
Performance Shares [Member] | Certain Senior Executives [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of Performance Shares Granted (in Shares)     100,000 100,000
Weighted Average Price at Grant Date (in Dollars per Share) $ 61.59 $ 64.82 $ 61.59 $ 64.82
Risk-Free Interest Rate     2.40% 1.50%
Dividend Yield     1.30% 1.10%
Volatility Factor     38.90% 38.30%
Expected Life of Award     2 years 10 months 24 days 2 years 10 months 24 days
Performance Shares [Member] | Certain Officers and Certain Senior Managers [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of Performance Shares Granted (in Shares)     24,490 26,300
Weighted Average Price at Grant Date (in Dollars per Share) $ 57.19 $ 58.77 $ 57.19 $ 58.77