Shareholders' Equity Restricted Stock and Restricted Stock Units (Details) (USD $) In Millions, except Share data, unless otherwise specified	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 28, 2014	Jun. 29, 2013	Jun. 28, 2014	Jun. 29, 2013	Dec. 28, 2013
Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Share-based Awards Other than Options	$ 10.6		$ 10.6
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Outstanding, Weighted Average Remaining Contractual Terms			2 years 2 months 27 days		1 year 11 months 5 days
Allocated Share-based Compensation Expense	1.4	1.2	2.5	2.0
Number of shares
Unvested restricted stock awards beginning balance (in shares)			210,264
Granted			77,950
Vested			45,873
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value			$ 71.35
Forfeited			5,035
Unvested restricted stock awards ending balance (in shares)	237,306		237,306		210,264
Weighted Average Value
Unvested restricted stock beginning balance (per share)			$ 65.57
Granted			$ 75.76
Unvested restricted stock ending balance (per share)	$ 67.85		$ 67.85		$ 65.57
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value			$ 63.05
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Share-based Awards Other than Options	1.1		1.1
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Outstanding, Weighted Average Remaining Contractual Terms			10 months 6 days		2 years
Allocated Share-based Compensation Expense	0.4	0.3	0.8	0.4
Number of shares
Unvested restricted stock awards beginning balance (in shares)			40,717
Granted			12,144
Vested			27,170
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value			$ 67.90
Forfeited			0
Unvested restricted stock awards ending balance (in shares)	25,691		25,691		40,717
Weighted Average Value
Unvested restricted stock beginning balance (per share)			$ 66.50
Granted			$ 75.76
Unvested restricted stock ending balance (per share)	$ 69.40		$ 69.40		$ 66.50
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value			$ 0.00
Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate			0.90%	0.30%
Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Share-based Awards Other than Options	3.3		3.3
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Outstanding, Weighted Average Remaining Contractual Terms			2 years 5 months 23 days		2 years 4 months 6 days
Allocated Share-based Compensation Expense	$ 0.2	$ 0.1	$ 0.4	$ 0.1
Number of shares
Unvested restricted stock awards beginning balance (in shares)			35,730
Granted			25,310
Vested			0
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value			$ 0.00
Forfeited			1,645
Unvested restricted stock awards ending balance (in shares)	59,395		59,395		35,730
Weighted Average Value
Unvested restricted stock beginning balance (per share)			$ 56.71
Granted			$ 83.74
Unvested restricted stock ending balance (per share)	$ 68.23		$ 68.23		$ 56.71
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value			$ 56.71
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term			3 years	3 years
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate			32.00%	35.00%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate			1.10%	1.20%