Leases Lease expense (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 30, 2019	Mar. 31, 2018
Leases [Abstract]
Operating lease cost	$ 13.3
Short-term lease cost	1.3
Amortization of right-of-use assets	0.7
Interest on lease liabilities	0.2
Total finance lease cost	0.9
Sublease income	0.3	$ 0.2
Supplemental Cash Flow Information For Lessee
Operating cash flows from operating leases	14.5
Operating cash flows from finance leases	0.1
Financing cash flows from finance leases	0.8
Right-Of-Use-Asset Obtained In Exchange For Operating Lease Liability	1.5
Right-Of-Use-Asset Obtained In Exchange For Finance Lease Liability	$ 9.2
Weighted Average Discount Rate, Operating	6.20%
Weighted Average Discount Rate, Finance	6.30%