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		6 Months Ended
	Jun. 30, 2017	Jul. 01, 2016	Jun. 30, 2017	Jul. 01, 2016
Defined Benefit Plan Disclosure
Service cost	$ 0.2	$ 0.2	$ 0.4	$ 0.4
Interest cost	1.3	1.4	2.6	2.8
Amortization of actuarial loss	0.0	0.1	0.0	0.2
Amortization of prior service credit	(0.8)	(0.8)	(1.6)	(1.6)
Net periodic benefit cost	$ 0.7	$ 0.9	$ 1.4	$ 1.8