Inventory (Details 2) - USD ($) $ in Millions	Sep. 27, 2018	Dec. 31, 2017
Inventories [Line Items]
Costs Incurred in Anticipation of Contracts	$ 152.9
Forward Loss Provision, gross	219.9
Transition adjustment - capitalized costs (pretax)	43.0
Block And Order Detail [Abstract]
Transition Adjustment - deferred production costs	$ 640.3
forward loss provision		$ 254.5