Other Current Liabilities and Other Liabilities (Details) - USD ($) $ in Millions		Dec. 20, 2016	Sep. 29, 2017	Dec. 31, 2016
Other Current Liabilities [Abstract]
Accrued product warranty costs			$ 65.0	$ 68.0
Estimated costs in excess of estimated contract value to complete contracts in process in a loss position			63.0	70.0
Accrued interest			47.0	43.0
Deferred revenues			40.0	34.0
Accruals for pending and threatened litigation	[1]		1.0	51.0
Product returns allowance	[2]		1.0	5.0
Other			149.0	160.0
Total other current liabilities			366.0	431.0
Accruals for pending and threatened litigation	[1]		1.0	51.0
Other Liabilities [Abstract]
Non-current income taxes payable (see Note 11)			131.0	124.0
Deferred compensation			49.0	47.0
Estimated contingent purchase price payable for acquired businesses (see Note 5)			40.0	29.0
Accrued product warranty costs			30.0	41.0
Accrued workers' compensation			27.0	30.0
Notes payable and capital lease obligations			16.0	13.0
Other			92.0	84.0
Total other liabilities			$ 385.0	368.0
Securities Class Action [Member]
Other Current Liabilities [Abstract]
Settlement agreement amount		$ 34.5
Electronic Systems [Member] | EoTech HWS [Member]
Other Current Liabilities [Abstract]
Accruals for pending and threatened litigation				14.0
Accruals for pending and threatened litigation				$ 14.0

[1] The year ended December 31, 2016 included $14 million in connection with the EoTech matter and $34.5 million in connection with the securities class action (see Note 18).

[2] On March 23, 2017, the Company ended the voluntary return program for various EoTech holographic weapons sight products in connection with the settlement of the class action lawsuit. On July 7, 2017, the court granted final approval of the settlement (see Note 18).