Goodwill and Other Intangible Assets - Components of Other Intangible Assets (Detail) - USD ($) $ in Millions |
Dec. 31, 2016 |
Dec. 31, 2015 |
|---|---|---|
| Finite Lived Intangible Assets [Line Items] | ||
| Gross Carrying Amount | $ 148.3 | $ 152.7 |
| Accumulated Amortization | (94.0) | (83.4) |
| Net Book Value | 54.3 | 69.3 |
| Customer Relationships | ||
| Finite Lived Intangible Assets [Line Items] | ||
| Gross Carrying Amount | 138.8 | 140.2 |
| Accumulated Amortization | (85.3) | (71.8) |
| Net Book Value | 53.5 | 68.4 |
| Trade Names | ||
| Finite Lived Intangible Assets [Line Items] | ||
| Gross Carrying Amount | 6.3 | 6.3 |
| Accumulated Amortization | (5.5) | (5.5) |
| Net Book Value | 0.8 | 0.8 |
| Trademarks, Licenses and Agreements | ||
| Finite Lived Intangible Assets [Line Items] | ||
| Gross Carrying Amount | 3.2 | 6.2 |
| Accumulated Amortization | (3.2) | (6.1) |
| Net Book Value | $ 0.0 | $ 0.1 |