Shareholders' Equity Restricted Stock and Restricted Stock Units (Details) (USD $) In Millions, except Share data, unless otherwise specified	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 27, 2014	Sep. 28, 2013	Sep. 27, 2014	Sep. 28, 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	$ 10.4		$ 10.4
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Outstanding, Weighted Average Remaining Contractual Terms			2 years 0 months 4 days		1 year 11 months 5 days
Allocated Share-based Compensation Expense	0.6	1.0	3.0	3.0
Number of shares
Unvested restricted stock awards beginning balance (in shares)			210,264
Granted			83,850
Vested			47,048
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value			$ 70.89
Forfeited			5,885
Unvested restricted stock awards ending balance (in shares)	241,181		241,181		210,264
Weighted Average Value
Unvested restricted stock beginning balance (per share)			$ 65.57
Granted			$ 75.41
Unvested restricted stock ending balance (per share)	$ 68.00		$ 68.00		$ 65.57
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value			$ 63.51
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	0.7		0.7
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Outstanding, Weighted Average Remaining Contractual Terms			7 months 10 days		9 months 18 days
Allocated Share-based Compensation Expense	0.3	0.5	1.2	0.9
Number of shares
Unvested restricted stock awards beginning balance (in shares)			40,717
Granted			12,144
Vested			28,047
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value			$ 67.83
Forfeited			0
Unvested restricted stock awards ending balance (in shares)	24,814		24,814		40,717
Weighted Average Value
Unvested restricted stock beginning balance (per share)			$ 66.50
Granted			$ 75.76
Unvested restricted stock ending balance (per share)	$ 69.53		$ 69.53		$ 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	3.0		3.0
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Outstanding, Weighted Average Remaining Contractual Terms			2 years 2 months 23 days		2 years 4 months 24 days
Allocated Share-based Compensation Expense	$ 0.3	$ 0.2	$ 0.7	$ 0.3
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%