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NON-OPERATING INCOME (EXPENSE) (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Mar. 31, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Nonoperating Income (Expense) [Abstract] |  |  |  |  |
Interest income | $ 2.0 |  | $ 5.0 | $ 8.0 | $ 14.0
SERP market adjustments | (0.0) |  | 0.0 | 1.0 | 0.0
Interest expense | (5.0) |  | (5.0) | (14.0) | (15.0)
Amortization of debt charges | 0.0 |  | 0.0 | (1.0) | (1.0)
Interest Costs Capitalized Adjustment | (1.0) |  |  |  |
Interest Costs Capitalized |  |  | 1.0 | 1.0 | 3.0
Interest expense, net | (4.0) |  | 2.0 | (5.0) | 1.0
Net periodic pension cost, excluding service cost | (1.0) |  | (1.0) | (2.0) | (4.0)
Gain on acquisition of controlling interest | 0.0 | $ 14.0 | 0.0 | 14.0 | 0.0
Foreign currency gain (loss) | (0.0) |  | (1.0) | (4.0) | (1.0)
Other non-operating items | (1.0) |  | (2.0) | 8.0 | (4.0)
Total non-operating income (expense) | $ (5.0) |  | $ 0.0 | $ 3.0 | $ (4.0)

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