Fair Value Measurements (Financial Assets And Liabilities Carried At Fair Value) (Details) (USD $) In Millions, unless otherwise specified	Sep. 26, 2014	Dec. 31, 2013
Assets:
Available-for-sale securities	$ 486.9	$ 385.2
Liabilities:
Deferred compensation plans	74.2	70.1
Quoted Prices In Active Market (Level 1)
Assets:
Available-for-sale securities	486.9	385.2
Liabilities:
Deferred compensation plans	0	0
Significant Other Observable Inputs (Level 2)
Assets:
Available-for-sale securities	0	0
Liabilities:
Deferred compensation plans	74.2	70.1
Significant Unobservable Inputs (Level 3)
Assets:
Available-for-sale securities	0	0
Liabilities:
Deferred compensation plans	$ 0	$ 0