Other Current Assets & Other Current Liabilities - Other Current Liabilities (Details) - USD ($) $ in Millions	Jun. 30, 2018	Dec. 31, 2017
Other Current Assets and Other Current Liabilities [Abstract]
Warranty accruals	$ 335.4	$ 321.3
Contingencies related to completed contracts	177.5	214.9
Provisions	176.3	223.0
Social security liability	120.4	145.0
Redeemable financial liability	123.9	69.7
Other taxes payable	93.9	204.4
Compensation accrual	83.8	123.5
Liabilities held for sale	22.9	13.7
Current portion of accrued pension and other post-retirement benefits	10.1	10.3
Other accrued liabilities	333.2	362.1
Total other current liabilities	$ 1,477.4	$ 1,687.9