Business Segments (Sales and Long-lived Assets) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended																12 Months Ended
	Dec. 28, 2014		Sep. 28, 2014		Jun. 29, 2014		Mar. 30, 2014		Dec. 29, 2013		Sep. 29, 2013		Jun. 30, 2013		Mar. 31, 2013		Dec. 28, 2014	Dec. 29, 2013	Dec. 30, 2012
Sales
Sales	$ 622.3	[1]	$ 601.1	[1]	$ 597.1	[1]	$ 573.5	[1]	$ 596.6	[2]	$ 571.6	[2]	$ 601.0	[2]	$ 569.4	[2]	$ 2,394.0	$ 2,338.6	$ 2,127.3
Long-lived assets
Long-lived assets	1,924.0								1,952.0								1,924.0	1,952.0	1,661.6
United States
Sales
Sales																	1,852.0	1,776.8	1,699.5
Long-lived assets
Long-lived assets	1,364.7								1,320.2								1,364.7	1,320.2	1,068.0
Canada
Sales
Sales																	230.1	221.7	224.4
Long-lived assets
Long-lived assets	310.5								354.1								310.5	354.1	393.4
United Kingdom
Sales
Sales																	139.8	174.2	118.2
Long-lived assets
Long-lived assets	120.6								131.5								120.6	131.5	122.8
All other countries
Sales
Sales																	172.1	165.9	85.2
Long-lived assets
Long-lived assets	$ 128.2								$ 146.2								$ 128.2	$ 146.2	$ 77.4

[1] Fiscal year 2014 was a P364D-week year, each quarter contained P91D weeks.

[2] Fiscal year 2013 was a P364D-week year, each quarter contained P91D weeks.