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Debt - Future Maturities Of Debt (Parenthetical) (Detail) - USD ($)
$ in Millions
12 Months Ended
Mar. 20, 2014
Mar. 13, 2012
Dec. 31, 2015
Dec. 31, 2014
Debt Instrument [Line Items]        
Unamortized debt issuance cost     $ 25.6 $ 30.5
8.25% Senior Notes Due March 15, 2019        
Debt Instrument [Line Items]        
Unamortized debt issuance cost     25.6  
Discount on senior notes     $ 2.6  
Interest rate 8.25% 8.25% 8.25% 8.25%
Maturity date Mar. 15, 2019 Mar. 15, 2019 Mar. 15, 2019  
Senior Notes        
Debt Instrument [Line Items]        
Adjustment for fair value hedges     $ 0.7