Fair Value Measurements, Assets and Liabilities (Details) (USD $) In Millions, unless otherwise specified	Mar. 30, 2013	Dec. 31, 2012
Assets
Cash equivalents	$ 331.2	$ 73.6
Investments in mutual funds, unit trusts and other similar instruments	9.9	36.6
Insurance contracts	65.2	62.5
Auction rate securities	4.2	4.3
Derivative contracts	2.1	1.6
Total Assets	412.6	178.6
Liabilities
Derivative contracts	0.7	0.8
Contingent consideration	20.0	20.1
Total Liabilities	20.7	20.9
Quoted Prices in Active Markets (Level I) [Member]
Assets
Cash equivalents	331.2	73.6
Investments in mutual funds, unit trusts and other similar instruments	9.9	36.6
Total Assets	341.1	110.2
Significant Other Observable Inputs (Level 2) [Member]
Assets
Insurance contracts	65.2	62.5
Derivative contracts	2.1	1.6
Total Assets	67.3	64.1
Liabilities
Derivative contracts	0.7	0.8
Total Liabilities	0.7	0.8
Significant Unobservable Inputs (Level 3) [Member]
Assets
Auction rate securities	4.2	4.3
Total Assets	4.2	4.3
Liabilities
Contingent consideration	20.0	20.1
Total Liabilities	$ 20.0	$ 20.1