Share-Based Compensation - Expense Included in Selling, General and Administrative Expenses Related to Stock Options and Restricted Stock Awards (Details) - Selling, General and Administrative Expenses - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 28, 2018	Sep. 29, 2017	Sep. 28, 2018	Sep. 29, 2017
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation expense	$ 1.8	$ 2.9	$ 8.8	$ 9.4
Stock Options
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation expense	0.0	0.1	0.1	0.4
RSUs/PSUs
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation expense	1.7	2.8	7.6	8.1
RSAs
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation expense	$ 0.1	$ 0.0	$ 1.1	$ 0.9