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CAPITAL RISK MANAGEMENT (Details) - USD ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | --- | ---
Capital risk management [Abstract] |  |  |
Equity | $ 2,139.5 | $ 2,073.2 |
Long-term debt | 1,007.7 | 889.5 |
Gross Capital | 3,147.2 | 2,962.7 |
Cash and cash equivalents | 216.2 | 185.9 | $ 335.5
Total | $ 2,931.0 | $ 2,776.8 |

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