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Non-Controlling Interests, Preferred Shares, Common Shares and Common Shares in Treasury - Common Shares Through Open Market Sales (Detail) (USD $) In Millions, except Per Share data, unless otherwise specified | 12 Months Ended
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Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Equity Offerings [Line Items] |  |  |
Number of Shares Sold | 36.5 | 9.5 | 53.0
Average Price Per Share | $ 13.98 | $ 13.71 | $ 8.33
Net Proceeds | $ 493.2 | $ 129.7 | $ 441.3

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