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Long-term debt - Aggregate Maturities of Long-Term Debt (Detail) (USD $) In Millions, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Schedule Of Long Term Debt Maturities [Line Items]
2013	$ 34.2
2014	205.7
2015	28.2
2016	28.5
2017	39.7
2018 and thereafter	648.6
Subtotal	984.9
Less amounts representing interest on capital leases and discount on other debt obligations	74.8
Total long-term debt	$ 910.1	$ 736.4

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