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SEGMENT INFORMATION (Financial Information by Geographic Area) (Detail) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating revenue | $ 666.3 | $ 667.4 | $ 678.1 | $ 651.8 | $ 624.6 | $ 613.4 | $ 613.9 | $ 584.5 | $ 2,663.6 | $ 2,436.4 | $ 2,303.9
Percentage of operating revenues |  |  |  |  |  |  |  |  | 100.00% | 100.00% | 100.00%
Long-lived assets | 3,947.4 |  |  |  | 4,070.5 |  |  |  | $ 3,947.4 | $ 4,070.5 |
Percentage of consolidated long-lived assets |  |  |  |  |  |  |  |  | 100.00% | 100.00% |
U.S. |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating revenue |  |  |  |  |  |  |  |  | $ 2,041.7 | $ 1,810.2 | $ 1,766.0
Percentage of operating revenues |  |  |  |  |  |  |  |  | 77.00% | 74.00% | 77.00%
Long-lived assets | 3,248.3 |  |  |  | 3,287.5 |  |  |  | $ 3,248.3 | $ 3,287.5 |
Percentage of consolidated long-lived assets |  |  |  |  |  |  |  |  | 82.00% | 81.00% |
U.K. |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Long-lived assets | 45.5 |  |  |  | 55.8 |  |  |  | $ 45.5 | $ 55.8 |
Percentage of consolidated long-lived assets |  |  |  |  |  |  |  |  | 1.00% | 1.00% |
Canada |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating revenue |  |  |  |  |  |  |  |  | $ 224.1 | $ 217.0 | $ 144.7
Percentage of operating revenues |  |  |  |  |  |  |  |  | 8.00% | 9.00% | 6.00%
Long-lived assets | 353.1 |  |  |  | 371.9 |  |  |  | $ 353.1 | $ 371.9 |
Percentage of consolidated long-lived assets |  |  |  |  |  |  |  |  | 9.00% | 9.00% |
Other |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating revenue |  |  |  |  |  |  |  |  | $ 262.3 | $ 255.0 | $ 237.6
Percentage of operating revenues |  |  |  |  |  |  |  |  | 10.00% | 11.00% | 10.00%
Long-lived assets | $ 300.5 |  |  |  | $ 355.3 |  |  |  | $ 300.5 | $ 355.3 |
Percentage of consolidated long-lived assets |  |  |  |  |  |  |  |  | 8.00% | 9.00% |

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