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RECENT ACCOUNTING PRONOUNCEMENTS Adoption of ASU 2017-07 - Restatement of Prior Year Amounts (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Costs of revenue | $ 470.8 | $ 425.9 |  | $ 935.9 | $ 848.6 |
General and administrative expenses | 63.0 | 64.6 |  | 128.1 | 130.3 |
Sales and marketing expenses | 43.4 | 43.8 |  | 86.9 | 86.9 |
Research and development expenses | 25.8 | 22.6 |  | 50.5 | 45.0 |
Operating income | 80.3 | 59.1 | [1] | 190.9 | 116.1 | [1]
Interest and non-operating (income) expenses, net | $ 1.5 | 0.5 |  | $ 3.3 | 2.7 |
Accounting Standards Update 2017-07 [Member] | Restatement Adjustment [Member] |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Costs of revenue |  | (0.6) |  |  | (1.4) |
General and administrative expenses |  | (0.7) |  |  | (1.2) |
Sales and marketing expenses |  | (0.1) |  |  | (0.1) |
Research and development expenses |  |  |  |  | (0.1) |
Operating income |  | 1.4 |  |  | 2.8 |
Interest and non-operating (income) expenses, net |  | 1.4 |  |  | 2.8 |
Accounting Standards Update 2017-07 [Member] | Previously Reported [Member] |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Costs of revenue |  | 426.5 |  |  | 850.0 |
General and administrative expenses |  | 65.3 |  |  | 131.5 |
Sales and marketing expenses |  | 43.9 |  |  | 87.0 |
Research and development expenses |  |  |  |  | 45.1 |
Operating income |  | 57.7 |  |  | 113.3 |
Interest and non-operating (income) expenses, net |  | $ (0.9) |  |  | $ (0.1) |
[1] | (a)Operating income and operating margin for the three and six months ended June 30, 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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