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Selected Financial Information (Detail) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2016 | Jun. 30, 2015 | Jun. 30, 2016 | Jun. 30, 2015
Segment Reporting Information [Line Items] |  |  |  |
Revenue | $ 425.7 | $ 378.5 | $ 831.4 | $ 731.6
Operating income (loss) | 63.5 | 51.4 | 115.4 | 87.9
Corporate |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Operating income (loss) | (29.5) | (22.0) | (53.3) | (42.8)
Segment Revenues Gross Intersegment [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenue | 440.9 | 392.8 | 861.8 | 759.9
Segment Revenues Gross Intersegment [Member] | U.S. Information Services |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenue | 256.8 | 233.1 | 503.8 | 452.1
Segment Revenues Gross Intersegment [Member] | International |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenue | 77.6 | 67.5 | 145.4 | 131.0
Segment Revenues Gross Intersegment [Member] | Interactive [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenue | 106.5 | 92.2 | 212.6 | 176.8
Intersegment Eliminations [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenue | (15.2) | (14.3) | (30.3) | (28.3)
Operating income (loss) | 0.0 | 0.0 | 0.0 | 0.0
Intersegment Eliminations [Member] | U.S. Information Services |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenue | (14.2) | (13.5) | (28.4) | (26.8)
Operating income (loss) | (13.8) | (13.1) | (27.7) | (26.1)
Intersegment Eliminations [Member] | International |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenue | (1.0) | (0.8) | (1.9) | (1.5)
Operating income (loss) | (0.7) | (0.5) | (1.4) | (0.9)
Intersegment Eliminations [Member] | Interactive [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenue | 0.0 | 0.0 | 0.0 | 0.0
Operating income (loss) | 14.6 | 13.6 | 29.1 | 27.0
Segment Operating Income Gross Intersegment [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Operating income (loss) | 63.5 | 51.4 | 115.4 | 87.9
Segment Operating Income Gross Intersegment [Member] | U.S. Information Services |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Operating income (loss) | 41.4 | 38.4 | 71.6 | 66.1
Segment Operating Income Gross Intersegment [Member] | International |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Operating income (loss) | 8.1 | 1.9 | 13.1 | 4.6
Segment Operating Income Gross Intersegment [Member] | Interactive [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Operating income (loss) | $ 43.6 | $ 33.2 | $ 84.0 | $ 59.9

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