Other Current Liabilities (Details) - USD ($) $ in Millions	Jun. 30, 2017	Dec. 31, 2016
Other Liabilities, Current [Abstract]
Accruals on completed contracts	$ 305.4	$ 271.9
Deferred income on contracts	372.8	407.6
Contingencies related to contracts	415.2	370.1
Other taxes payable	283.3	143.5
Social security liability	113.9	66.3
Redeemable financial liability	59.8	33.7
Other	709.9	532.2
Total other current liabilities	$ 2,260.3	$ 1,825.3