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Goodwill and Intangible Assets - Schedule of Other Intangible Asset (Detail) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2019 | Dec. 31, 2018
Schedule of Finite and Indefinite Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | $ 534.6 | $ 531.1
Accumulated Amortization | (350.3) | (343.6)
Net | 184.3 | 187.5
Trade Name [Member] |  |
Schedule of Finite and Indefinite Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 173.7 | 173.5
Accumulated Amortization | (1.9) | (1.9)
Net | 171.8 | 171.6
Customer Lists and Relationships [Member] |  |
Schedule of Finite and Indefinite Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 206.8 | 205.4
Accumulated Amortization | (195.7) | (190.2)
Net | $ 11.1 | $ 15.2
Customer Lists and Relationships [Member] | Minimum [Member] |  |
Schedule of Finite and Indefinite Lived Intangible Assets [Line Items] |  |
Estimated Life Range (Years) | 5 years | 5 years
Customer Lists and Relationships [Member] | Maximum [Member] |  |
Schedule of Finite and Indefinite Lived Intangible Assets [Line Items] |  |
Estimated Life Range (Years) | 15 years | 15 years
Technology [Member] |  |
Schedule of Finite and Indefinite Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | $ 154.1 | $ 152.2
Accumulated Amortization | (152.7) | (151.5)
Net | $ 1.4 | $ 0.7
Technology [Member] | Minimum [Member] |  |
Schedule of Finite and Indefinite Lived Intangible Assets [Line Items] |  |
Estimated Life Range (Years) | 3 years | 3 years
Technology [Member] | Maximum [Member] |  |
Schedule of Finite and Indefinite Lived Intangible Assets [Line Items] |  |
Estimated Life Range (Years) | 4 years | 4 years

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