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Future Minimum Lease Payments for Non-Cancelable Operating Lease (Detail) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2012
Operating Leased Assets [Line Items]  
2013 $ 83.9
2014 75.8
2015 68.8
2016 61.7
2017 59.8
Later Years 359.7
Total Minimum Lease Payments 709.7
Less: Sublease Rentals (24.1)
Net Minimum Lease Payments $ 685.6