Other Current Liabilities (Details) - USD ($) $ in Millions	Mar. 31, 2017	Dec. 31, 2016
Other Liabilities, Current [Abstract]
Accruals on completed contracts	$ 304.8	$ 271.9
Deferred income on contracts	364.6	407.6
Contingencies related to contracts	390.9	370.1
Other taxes payable	236.2	143.5
Redeemable financial liability	88.2	33.7
Other	805.6	598.5
Total other current liabilities	$ 2,190.3	$ 1,825.3