Defined Benefit Plans (Components Of Net Periodic Benefit Cost Of Other PostRetirement Benefit Pension Pans) (Details) - Other postretirement benefit plans - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 29, 2017	Sep. 30, 2016	Sep. 29, 2017	Sep. 30, 2016
Defined Benefit Plan Disclosure
Service cost	$ 0.1	$ 0.2	$ 0.5	$ 0.6
Interest cost	1.1	1.4	3.7	4.2
Amortization of actuarial (gain) loss	0.0	(0.1)	0.0	0.1
Amortization of prior service credit	(0.8)	(0.8)	(2.4)	(2.4)
Net periodic benefit cost	$ 0.4	$ 0.7	$ 1.8	$ 2.5