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RECENT ACCOUNTING PRONOUNCEMENTS Adoption of ASU 2017-07 - Restatement of Prior Year Amounts (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2018 | Mar. 31, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Costs of revenue | $ 465.1 | $ 422.7 |
General and administrative expenses | 65.1 | 65.7 |
Sales and marketing expenses | 43.5 | 43.1 |
Research and development expenses | 24.7 | 22.4 |
Operating income | 110.6 | 57.0 | [1]
Interest and non-operating expenses, net | $ (1.8) | (2.2) |
Accounting Standards Update 2017-07 [Member] | Restatement Adjustment [Member] |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Costs of revenue |  | (0.8) |
General and administrative expenses |  | (0.5) |
Research and development expenses |  | (0.1) |
Operating income |  | 1.4 |
Interest and non-operating expenses, net |  | (1.4) |
Accounting Standards Update 2017-07 [Member] | Scenario, Previously Reported [Member] |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Costs of revenue |  | 423.5 |
General and administrative expenses |  | 66.2 |
Research and development expenses |  | 22.5 |
Operating income |  | 55.6 |
Interest and non-operating expenses, net |  | $ (0.8) |
[1] | (a)Operating income and operating margin for the three months ended March 31, 2017 has been restated to reflect the adoption of ASU 2017-07. Refer to Note 2, Recent Accounting Pronouncements for further information.

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