THE COMPANY AND SIGNIFICANT ACCOUNTING POLICIES - Pension plan (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Equity Securities - International
Employee benefit plan disclosures
Target Allocation (as a percent)	27.00%
Bond market fund
Employee benefit plan disclosures
Target Allocation (as a percent)	43.00%
Private Real Estate
Employee benefit plan disclosures
Target Allocation (as a percent)	23.00%
U.S. Pension Benefits
Employee benefit plan disclosures
Aggregated fair value of plan assets at end of period	$ 76.3	$ 63.2
U.S. Pension Benefits \| Significant other observable inputs (Level 2)
Employee benefit plan disclosures
Valuation percentage of plan assets	93.00%
U.S. Pension Benefits \| Investments at net Asset value
Employee benefit plan disclosures
Valuation percentage of plan assets	7.00%
International Pension Benefits
Employee benefit plan disclosures
Aggregated fair value of plan assets at end of period	$ 119.4	$ 107.2
International Pension Benefits \| Quoted prices in active market (Level 1)
Employee benefit plan disclosures
Valuation percentage of plan assets	2.00%
International Pension Benefits \| Investments at net Asset value
Employee benefit plan disclosures
Valuation percentage of plan assets	61.00%
International Pension Benefits \| Collective trust fund
Employee benefit plan disclosures
Valuation percentage of plan assets	37.00%
International Pension Benefits and Terminated U.S. Retiree Health Plan
Employee benefit plan disclosures
Target Allocation (as a percent)	7.00%