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RECENT ACCOUNTING PRONOUNCEMENTS Adoption of ASU 2017-07 - Restatement of Prior Year Amounts (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Costs of revenue |  | $ 454.1 | $ 441.2 |  | $ 1,390.0 | $ 1,289.8 |
General and administrative expenses |  | 68.0 | 70.1 |  | 196.6 | 200.4 |
Sales and marketing expenses |  | 40.8 | 41.3 |  | 127.7 | 128.2 |
Research and development expenses |  | 24.2 | 23.0 |  | 74.7 | 68.0 |
Operating income |  | 137.8 | 133.1 | [1] | 328.7 | 249.2 | [1]
Interest and non-operating expenses, net |  | $ 0.7 | 5.5 |  | $ 4.0 | 8.2 |
Accounting Standards Update 2017-07 [Member] | Restatement Adjustment [Member] |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Costs of revenue |  |  | (0.7) |  |  | (2.1) |
General and administrative expenses |  |  | (4.5) |  |  | (5.7) |
Sales and marketing expenses |  |  |  |  |  | (0.1) |
Research and development expenses |  |  | (0.1) |  |  | (0.2) |
Operating income |  |  | 5.3 |  |  | 8.1 |
Interest and non-operating expenses, net |  |  | 5.3 |  |  | 8.1 |
Accounting Standards Update 2017-07 [Member] | Previously Reported [Member] |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Costs of revenue |  |  | 441.9 |  |  | 1,291.9 |
General and administrative expenses | [2] |  | 74.6 |  |  | 206.1 |
Sales and marketing expenses |  |  |  |  |  | 128.3 |
Research and development expenses |  |  | 23.1 |  |  | 68.2 |
Operating income |  |  | 127.8 |  |  | 241.1 |
Interest and non-operating expenses, net |  |  | $ 0.2 |  |  | $ 0.1 |
[1] | (a)Operating income and operating margin for the three and nine months ended September 30, 2017 has been restated to reflect the adoption of ASU 2017-07. Refer to Note 2, Recent Accounting Pronouncements for further information.
[2] | (a)Previously reported General and administrative expenses excludes $0.9 in both the three and nine months ended September 30, 2017 related to gains on the sale of long-lived assets which has been reclassed to conform with current year presentation.

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