Leases - Narrative (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 28, 2019	Sep. 29, 2018	Sep. 28, 2019	Sep. 29, 2018	Dec. 29, 2018
Lessee, Lease, Description [Line Items]
Remaining term of contract ( in years )	7 years 10 months 24 days		7 years 10 months 24 days
Option to terminate ( in years )			1 year
Operating leases, rent expense		$ 14.7		$ 44.3
Sublease income	$ 0.2	$ 0.3	$ 0.7	$ 0.7
Capital lease assets					$ 6.7
Capital lease accumulated depreciation					$ 1.0
Minimum
Lessee, Lease, Description [Line Items]
Remaining term of contract ( in years )	1 year		1 year
Renewal term ( in years )	1 year		1 year
Maximum
Lessee, Lease, Description [Line Items]
Remaining term of contract ( in years )	22 years		22 years
Renewal term ( in years )	10 years		10 years