Fair Value Measurements (Financial Assets And Liabilities Carried At Fair Value) (Details) - USD ($) $ in Millions	Apr. 01, 2016	Dec. 31, 2015
Assets:
Available-for-sale securities	$ 90.1	$ 342.3
Liabilities:
Deferred compensation plans	71.5	77.4
Quoted Prices in Active Market (Level 1)
Assets:
Available-for-sale securities	90.1	342.3
Liabilities:
Deferred compensation plans	0.0	0.0
Significant Other Observable Inputs (Level 2)
Assets:
Available-for-sale securities	0.0	0.0
Liabilities:
Deferred compensation plans	71.5	77.4
Significant Unobservable Inputs (Level 3)
Assets:
Available-for-sale securities	0.0	0.0
Liabilities:
Deferred compensation plans	$ 0.0	$ 0.0