Earnings Per Share (Computation of Basic and Diluted Earnings Per Share) (Details) - shares shares in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Oct. 01, 2017	Sep. 30, 2018	Oct. 01, 2017
Earnings Per Share [Abstract]
Weighted average basic common shares outstanding (in shares)	35.9	35.3	35.7	35.2
Effect of dilutive securities (in shares)	1.3	1.1	1.3	1.0
Weighted average diluted common shares outstanding (in shares)	37.2	36.4	37.0	36.2