XML 72 R54.htm IDEA: XBRL DOCUMENT v3.8.0.1
Retirement Plans (Summary of Net Pension and Supplemental Executive Retirement Plan Expense Recognized) (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2018
Apr. 01, 2017
Compensation and Retirement Disclosure [Abstract]    
Service cost pertaining to benefits earned during the period $ 1.6 $ 1.8
Interest cost on projected benefit obligations 4.1 4.4
Expected return on pension assets (5.0) (4.9)
Net amortization loss 0.8 2.4
Net pension expense $ 1.5 $ 3.7