ACCOUNTING POLICIES (Details) $ in Millions	3 Months Ended	6 Months Ended	12 Months Ended
	Jun. 30, 2020 USD ($)	Jun. 30, 2020 USD ($) segment	Dec. 31, 2019 USD ($) segment	Mar. 31, 2020 USD ($)	[1]	Jun. 30, 2019 USD ($)	Mar. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)
Property, Plant and Equipment [Line Items]
Number of reportable segments | segment		2	4
Property, plant and equipment, net	$ 420.9	$ 420.9	$ 488.0
Property, plant and equipment, at cost	1,086.6	1,086.6	1,203.0
Accumulated depreciation	665.7	$ 665.7	715.0
Revenue shift	87.0
Accounting Standards Update [Extensible List]		us-gaap:AccountingStandardsUpdate201613Member
Decrease in retained earnings	879.5	$ 879.5	983.8	$ 785.3		$ 957.3	$ 941.5	$ 896.8
Cumulative effect adjustment
Property, Plant and Equipment [Line Items]
Decrease in retained earnings			2.0
Retained Earnings [Member] | Cumulative effect adjustment
Property, Plant and Equipment [Line Items]
Decrease in retained earnings			2.0
Tooling
Property, Plant and Equipment [Line Items]
Property, plant and equipment, net	$ 8.4	$ 8.4	12.9
Property, plant and equipment, at cost			94.4
Accumulated depreciation			$ 81.5

[1] The number of shares of Common Stock (par value $0.01 per share) outstanding at June 30, 2020 was 101.34.