Retirement Plans (Schedule of Amounts Recognized in Balance Sheet) (Details) - USD ($) $ in Millions	Dec. 29, 2017	Dec. 30, 2016
Amounts recognized on the consolidated balance sheet:
Non-current liabilities	$ (67.1)	$ (136.4)
Pension Benefits
Amounts recognized on the consolidated balance sheet:
Non-current assets	0.0	1.4
Current liabilities	(2.4)	(5.5)
Non-current liabilities	(25.4)	(92.3)
Net amount recognized on the consolidated balance sheet	(27.8)	(96.4)
Amounts recognized in accumulated other comprehensive income consist of:
Net actuarial loss	(8.6)	(89.7)
Prior service (cost) credit	(0.5)	0.4
Net amount recognized in accumulated other comprehensive income	(9.1)	(89.3)
Postretirement Benefits
Amounts recognized on the consolidated balance sheet:
Non-current assets	0.0	0.0
Current liabilities	(3.9)	(4.2)
Non-current liabilities	(41.7)	(43.3)
Net amount recognized on the consolidated balance sheet	(45.6)	(47.5)
Amounts recognized in accumulated other comprehensive income consist of:
Net actuarial loss	(3.0)	(2.8)
Prior service (cost) credit	10.2	12.3
Net amount recognized in accumulated other comprehensive income	$ 7.2	$ 9.5