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SEGMENT INFORMATION (Financial Information by Geographic Area) (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating revenue | $ 838.5 | $ 834.8 | $ 856.7 | $ 832.2 | $ 801.1 | $ 804.1 | $ 811.3 | $ 728.3 | $ 3,362.2 | $ 3,144.9 | $ 2,663.6
Percentage of operating revenues |  |  |  |  |  |  |  |  | 100.00% | 100.00% | 100.00%
Long-lived assets | 6,235.0 |  |  |  | 5,991.1 |  |  |  | $ 6,235.0 | $ 5,991.1 |
Percentage of consolidated long-lived assets |  |  |  |  |  |  |  |  | 100.00% | 100.00% |
U.S. |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating revenue |  |  |  |  |  |  |  |  | $ 2,379.7 | $ 2,290.9 | $ 2,041.7
Percentage of operating revenues |  |  |  |  |  |  |  |  | 71.00% | 73.00% | 77.00%
Long-lived assets | 3,274.5 |  |  |  | 3,282.5 |  |  |  | $ 3,274.5 | $ 3,282.5 |
Percentage of consolidated long-lived assets |  |  |  |  |  |  |  |  | 53.00% | 55.00% |
U.K. |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating revenue |  |  |  |  |  |  |  |  | $ 311.2 | $ 232.1 | $ 224.1
Percentage of operating revenues |  |  |  |  |  |  |  |  | 9.00% | 7.00% | 8.00%
Long-lived assets | 303.2 |  |  |  | 278.1 |  |  |  | $ 303.2 | $ 278.1 |
Percentage of consolidated long-lived assets |  |  |  |  |  |  |  |  | 5.00% | 5.00% |
Australia |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating revenue |  |  |  |  |  |  |  |  | $ 304.0 | $ 214.3 | $ 5.0
Percentage of operating revenues |  |  |  |  |  |  |  |  | 9.00% | 7.00% |
Long-lived assets | 2,207.1 |  |  |  | 2,061.7 |  |  |  | $ 2,207.1 | $ 2,061.7 |
Percentage of consolidated long-lived assets |  |  |  |  |  |  |  |  | 35.00% | 34.00% |
Canada |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating revenue |  |  |  |  |  |  |  |  | $ 148.9 | $ 134.3 | $ 135.5
Percentage of operating revenues |  |  |  |  |  |  |  |  | 4.00% | 4.00% | 5.00%
Long-lived assets | 67.4 |  |  |  | 52.4 |  |  |  | $ 67.4 | $ 52.4 |
Percentage of consolidated long-lived assets |  |  |  |  |  |  |  |  | 1.00% | 1.00% |
Other |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating revenue |  |  |  |  |  |  |  |  | $ 218.4 | $ 273.3 | $ 257.3
Percentage of operating revenues |  |  |  |  |  |  |  |  | 7.00% | 9.00% | 10.00%
Long-lived assets | $ 382.8 |  |  |  | $ 316.4 |  |  |  | $ 382.8 | $ 316.4 |
Percentage of consolidated long-lived assets |  |  |  |  |  |  |  |  | 6.00% | 5.00% |

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