Income Taxes (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Dec. 30, 2017	Dec. 31, 2018	Dec. 30, 2017	Dec. 31, 2016	Jan. 02, 2016
Income Tax Examination [Line Items]
Income tax expense			$ 59.1	$ 57.1	$ 48.4
Tax act, income tax expense (benefit) impact	$ 1.0
Expected tax liability to be reversed	51.0
Deemed repatriation of foreign earnings, tax expense	40.0
Foreign earnings not deemed repatriated, tax expense	10.0
Deferred tax liabilities	(106.8)		(106.8)	(75.3)
Deferred tax assets, non-current	28.5		28.5	22.4
Deferred tax liabilities	135.3		135.3	97.7
Unrecognized tax benefits which would impact the effective income tax rate	6.7		6.7
Unrecognized tax benefits, recognized interest expense			(0.2)	0.2	0.6
Unrecognized tax benefits, accrued interest	1.7		1.7	1.9	$ 1.7
Unrecognized tax benefits including accrued that could change in coming year	0.4		0.4
Net operating losses	12.9		$ 12.9	$ 12.4
Tax effected net operating losses, expiration period			15 years	15 years
Change in valuation allowance			$ 5.9	$ 6.8
Income tax holiday, amount of decrease in provision for income taxes			4.2
Deferred tax liability not recorded related to undistributed earnings of foreign subsidiaries	10.0		10.0
Undistributed earnings of foreign subsidiaries	$ 40.0		$ 40.0
Revenue Proclamation 2018-17 | Forecast | Minimum
Income Tax Examination [Line Items]
Income tax expense		$ 4.0
Revenue Proclamation 2018-17 | Forecast | Maximum
Income Tax Examination [Line Items]
Income tax expense		$ 5.0