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Leases - Least Cost (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jul. 01, 2018
Jun. 30, 2019
Jul. 01, 2018
Leases [Abstract]        
Operating lease cost $ 1.1 $ 1.0 $ 2.2 $ 1.9
Operating cash flows from operating leases $ 1.1 $ 1.0 $ 2.2 $ 1.9