Investments (Details) (USD $) In Millions	3 Months Ended	9 Months Ended
Oct. 01, 2011	Oct. 01, 2011	Dec. 31, 2010
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	$ 162.4	$ 162.4	$ 105.8
Gross unrealized gains	0	0	0
Gross unrealized losses	(0.2)	(0.2)	(0.1)
Fair value (net carrying amount)	162.2	162.2	105.7
Available-for-sale debt securities [Abstract]
Due in one year or less, amortized cost	74.2	74.2	84.8
Due after one year through two years, amortized cost	88.2	88.2	21.0
Total available-for-sale debt securities, amortized cost	162.4	162.4	105.8
Due in one year or less, fair value	74.1	74.1	84.7
Due after one year through two years, fair value	88.1	88.1	21.0
Total available-for-sale debt securities, fair value	162.2	162.2	105.7
Sales of available-for-sale securities		98.0
Redemptions of available-for-sale securities		65.0
Net adjustment to unrealized investment losses on available-for-sale securities	(0.1)	(0.2)
Agency Bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	93.2	93.2	31.0
Gross unrealized gains	0	0	0
Gross unrealized losses	(0.1)	(0.1)	0
Fair value (net carrying amount)	93.1	93.1	31.0
Corporate Bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	53.9	53.9	44.5
Gross unrealized gains	0	0	0
Gross unrealized losses	(0.1)	(0.1)	(0.1)
Fair value (net carrying amount)	53.8	53.8	44.4
Commercial Paper, Not Included with Cash and Cash Equivalents [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	14.5	14.5	29.5
Gross unrealized gains	0	0	0
Gross unrealized losses	0	0	0
Fair value (net carrying amount)	14.5	14.5	29.5
U.S. Treasury Bills [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	0.8	0.8	0.8
Gross unrealized gains	0	0	0
Gross unrealized losses	0	0	0
Fair value (net carrying amount)	$ 0.8	$ 0.8	$ 0.8

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