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Non-Controlling Interests, Preferred Shares, Common Shares and Common Shares in Treasury - Fair Value Hierarchy of Valuation Techniques Used by Company (Detail) (USD $) In Millions, unless otherwise specified | Mar. 18, 2011 | Dec. 31, 2010 Fair Value, Measurements, Recurring [Member] Warrants [Member] | Dec. 31, 2010 Level 1 [Member] Fair Value, Measurements, Recurring [Member] Warrants [Member] | Dec. 31, 2010 Level 2 [Member] Fair Value, Measurements, Recurring [Member] Warrants [Member] | Dec. 31, 2010 Level 3 [Member] Fair Value, Measurements, Recurring [Member] Warrants [Member]
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Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |  |  |  |
Derivative instrument liability, fair value | $ 74.3 | $ 96.2 | $ 0 | $ 0 | $ 96.2

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