INCOME TAXES - Deferred Tax Assets And Liabilities (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Deferred tax assets attributable to
Accrued expenses	$ 173.0	$ 133.0
Capital loss	21.1	21.1
Non-deductible interest	95.4	77.0
Foreign tax credit carryforwards	136.5	134.4
Other tax credits	146.0	163.8
Net operating loss carryforwards	455.5	383.5
Inventories	1.2	16.6
Research and development credit	3.8	2.9
Foreign exchange	17.2	0.0
Provisions for pensions and other long-term employee benefits	31.9	66.1
Contingencies	38.3	2.9
Margin recognition on construction contracts	18.0	20.6
Leases	183.4	170.4
Other	5.4	0.6
Deferred tax assets	1,326.7	1,192.9
Valuation allowance	(935.5)	(815.1)
Deferred tax assets, net of valuation allowance	391.2	377.8
Deferred tax liabilities attributable to
Revenue in excess of billings on contracts accounted for under the percentage of completion method	32.2	33.6
U.S. tax on foreign subsidiaries’ undistributed earnings not indefinitely reinvested	0.0	4.2
Property, plant and equipment, intangibles and other assets	162.8	180.1
Foreign exchange	0.0	43.9
Leases	169.4	161.1
Deferred tax liabilities	364.4	422.9
Net deferred tax assets/(liabilities)	$ 26.8
Net deferred tax assets/(liabilities)		$ (45.1)