Income Taxes (Deferred Income Tax) (Details) - USD ($) $ in Millions	Dec. 31, 2017	Jan. 01, 2017
Long-term:
Accrued liabilities	$ 16.9	$ 36.4
Inventory valuation	14.3	17.7
Accrued vacation	7.6	10.7
Deferred compensation and other benefit plans	11.6	24.5
Postretirement benefits other than pensions	3.0	4.6
Tax credit and net operating loss carryforward	49.8	47.7
Valuation allowance	(8.8)	(16.9)
Total deferred income tax assets	94.4	124.7
Long-term:
Property, plant and equipment differences	28.6	30.6
Intangible amortization	113.4	110.7
Other	3.4	4.8
Total deferred income tax liabilities	145.4	146.1
Net deferred income tax liabilities	$ 51.0	$ 21.4