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Fair Value and Carrying Value of Long-Term Debt (Parenthetical) (Detail) (USD $) In Millions, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Debt Instrument [Line Items]
Derivatives assets	$ 20.4	$ 12.6
Derivatives designated as accounting hedges
Debt Instrument [Line Items]
Derivatives assets	$ 18.4	$ 11.5

Fair value of derivative asset, presented on a gross basis even when the derivative instrument is subject to master netting arrangements and qualifies for net presentation in the statement of financial position.

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