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BUSINESS COMBINATION - PROFORMA (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015
Pro-forma Combined |  |
Operating revenue | $ 1,974.2 | $ 2,076.4
Net income | $ 84.9 | $ 107.7
Basic Earnings Per Share (in dollars per share) | $ 1.97 | $ 2.48
Diluted Earnings Per Share (in dollars per share) | $ 1.95 | $ 2.45
Weighted Average Number of Shares Outstanding: |  |
Basic | 43.1 | 43.5
Diluted | 43.5 | 44.0

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