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Investment in Affiliates and Other Assets - Components of Net Distributions from LPC (Detail) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Summary Of Investment Holdings [Line Items] |  |  |
Net distributions (contributions) | $ 10.9 | $ (20.7) | $ 3.8
LPC |  |  |
Summary Of Investment Holdings [Line Items] |  |  |
Distributions from LPC | 70.7 | 79.5 | 29.7
Contributions to LPC | (59.8) | (100.2) | (25.9)
Net distributions (contributions) | $ 10.9 | $ (20.7) | $ 3.8

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