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Quarterly Financial Summary - Schedule of Quarterly Financial Summary (Parenthetical) (Detail) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 12 Months Ended
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Dec. 31, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2011 | Sep. 30, 2011 | Jun. 30, 2011 | Mar. 31, 2011 | Dec. 31, 2012
Schedule Of Quarterly Financial Summary [Line Items] |  |  |  |  |  |  |  |
Insurance recovery |  |  | $ 19.0 |  |  |  | $ 7.0 |
Goodwill and asset impairment charges |  | 85.6 |  | 188.8 |  | 2.7 |  | 96.5
Legal costs related to regulatory matters |  |  |  |  | 11.4 |  |  |
Asset Impairment Charges | 41.4 |  |  |  |  |  |  |
Gain on sale of business |  |  |  | 27.1 |  |  |  |
Severance expense | $ 13.1 |  |  |  |  |  |  |

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