v3.19.1

Revenue Details Textual (Details) $ in Millions	3 Months Ended
	Mar. 29, 2019 USD ($) channel	Mar. 30, 2018 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)
Costs in Excess of Billings	$ 150.7		$ 168.3
Billings in Excess of Cost	$ 83.4		68.1
Number of Sales Channels | channel	3
Contract with Customer, Liability, Revenue Recognized	$ 80.1	$ 57.3
Percentage of Revenue related to Long-term contract	55.00%	70.00%
Contract with Customer, Liability	$ 148.5	$ 161.8	$ 140.0	$ 133.3
Sales Channel, Through Intermediary [Member] | Sales Revenue, Product Line [Member]
Concentration Risk, Percentage	41.00%
Sales Channel, Insurance [Member] | Sales Revenue, Product Line [Member]
Concentration Risk, Percentage	17.00%
Sales Channel, Directly to Consumer [Member] | Sales Revenue, Product Line [Member]
Concentration Risk, Percentage	41.00%
Sales Channel, Other [Member] | Sales Revenue, Product Line [Member]
Concentration Risk, Percentage	1.00%

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