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Debt Maturities (Detail) - USD ($)
$ in Millions
Dec. 31, 2015
Dec. 31, 2014
Debt Instrument [Line Items]    
2016 $ 593.5  
2017 729.3  
2018 1,167.1  
2019 976.0  
2020 995.4  
Thereafter 2,184.3  
Total principal payments 6,645.6  
Net discount and other (264.6)  
Total $ 6,381.0 $ 5,058.9