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Goodwill and Intangible Assets - Schedule of Other Intangible Asset (Detail) - USD ($) $ in Millions | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2018 | Dec. 31, 2017
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | $ 534.9 | $ 539.8
Accumulated Amortization | (338.3) | (333.3)
Net | 196.6 | 206.5
Customer Lists and Relationships [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 207.6 | 210.1
Accumulated Amortization | (183.6) | (177.0)
Net | $ 24.0 | $ 33.1
Customer Lists and Relationships [Member] | Minimum [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Estimated Life Range (Years) | 5 years | 5 years
Customer Lists and Relationships [Member] | Maximum [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Estimated Life Range (Years) | 15 years | 15 years
Trade Names [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | $ 173.8 | $ 174.1
Accumulated Amortization | (2.0) | (2.1)
Net | 171.8 | 172.0
Technology [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 153.5 | 155.6
Accumulated Amortization | (152.7) | (154.2)
Net | $ 0.8 | $ 1.4
Technology [Member] | Minimum [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Estimated Life Range (Years) | 2 years | 2 years
Technology [Member] | Maximum [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Estimated Life Range (Years) | 7 years | 7 years

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