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Debt and Credit Facilities - Lines of Credit (Parenthetical) (Detail) (USD $)
In Millions, unless otherwise specified
6 Months Ended
Jun. 30, 2013
Dec. 31, 2012
Jun. 30, 2013
Revolving Senior Secured Credit Facility [Member]
Line Of Credit [Line Items]      
Available credit facility $ 948.9 $ 989.5 $ 700.0
Credit facility expiration date     Oct. 31, 2016