OTHER CURRENT ASSETS & OTHER CURRENT LIABILITIES - Other Current Liabilities (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Other Current Assets & Other Current Liabilities [Abstract]
Warranty accruals and project contingencies	$ 119.5	$ 168.8
Legal provisions	121.7	127.6
Value - added tax and other taxes payable	71.0	109.6
Compensation accrual	85.7	54.3
Social security liability	70.4	67.9
Provisions	23.6	53.0
Current portion of accrued pension and other post-retirement benefits	5.2	6.9
Other accrued liabilities	163.3	230.2
Total other current liabilities	$ 660.4	$ 818.3