Indebtedness (Details) In Millions, unless otherwise specified	12 Months Ended		0 Months Ended	12 Months Ended		0 Months Ended	12 Months Ended
	Dec. 29, 2012 USD ($)	Dec. 20, 2002 USD ($)	Nov. 30, 2005 Note Agreement, 5.54% [Member] GBP (£)	Dec. 29, 2012 Note Agreement, 5.54% [Member]	Dec. 20, 2002 Senior Notes, Series A, 5.57% USD ($)	Dec. 20, 2002 Senior Note, Series B, 6.42% USD ($)	Dec. 29, 2012 Senior Note, Series B, 6.42%
Debt Instrument [Line Items]
Debt Instrument, Face Amount		$ 60.0	£ 65.0		$ 21.0	$ 39.0
Debt Instrument, Interest Rate, Stated Percentage			5.54%		5.57%	6.42%
Debt Instrument, Frequency of Periodic Payment			seven			four
Debt Instrument, Date of First Required Payment			Nov. 30, 2009			Dec. 31, 2009
Debt Instrument, Restrictive Covenants				The Note Agreement contains certain net worth and fixed charge coverage covenants and provides certain restrictions on our ability to borrow, incur liens, sell assets and pay dividends. We were in compliance with all covenants at the end of 2012.			The Note Agreement contains certain net worth and fixed charge coverage covenants and provides certain restrictions on our ability to borrow, incur liens, sell assets and pay dividends. We were in compliance with all covenants at the end of 2012.
Line of Credit Facility, Expiration Date	Feb. 09, 2017
Line of Credit Facility, Interest Rate Description	Interest is payable at a rate based on prime, LIBOR, or the U.S. federal funds rate, plus a spread that varies depending on the leverage ratios maintained
Line of Credit Facility, Covenant Terms	The agreement provides certain restrictions on our ability to borrow, incur liens, sell assets and pay dividends and contains certain cash flow and liquidity covenants. As of the end of 2012, we were in compliance with all debt covenants.
Line of Credit Facility, Maximum Borrowing Capacity	100.0
Letters of Credit Outstanding, Amount	14.3
Line of Credit Facility, Remaining Borrowing Capacity	$ 85.7