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Long-Term Debt - Components of Long-Term Debt (Detail) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2015
Sep. 30, 2015
Mar. 12, 2015
Dec. 31, 2014
Feb. 26, 2014
Oct. 09, 2013
Debt Instrument [Line Items]            
Total long-term debt, net of discounts   $ 1,835.1   $ 1,863.9    
Less current portion   (6.9)   (31.5)    
Long-term debt   1,828.2   1,832.4    
Amended Term Loan Facility            
Long-term Debt, Other Disclosures [Abstract]            
Repayments of Debt $ 24.6          
Aggregate principal amount outstanding   1,338.3        
Acquisition Term Loan            
Long-term Debt, Other Disclosures [Abstract]            
Repayments of Debt 12.5          
Aggregate principal amount outstanding   675.4       $ 700.0
Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months 1.7     1.8    
2011 Term Loan            
Long-term Debt, Other Disclosures [Abstract]            
Repayments of Debt $ 12.1          
Aggregate principal amount outstanding   662.9 $ 662.9   $ 675.0  
Amended Revolving Credit Facility            
Debt Instrument [Line Items]            
Revolving credit facility   0.0   0.0    
Long-term Debt, Other Disclosures [Abstract]            
Maximum borrowings available under credit facility   175.0        
5 3/4% Senior Notes Due 2021            
Debt Instrument [Line Items]            
Senior Secured Notes, net of discounts   $ 500.0   $ 500.0    
Long-term Debt, Other Disclosures [Abstract]            
Stated interest rate (percent)   5.75%   5.75%    
Spanish Government Loan Due 2025            
Debt Instrument [Line Items]            
Other Long-term Debt   $ 0.6   $ 0.7    
Amended Term Loan Facility | Acquisition Term Loan            
Debt Instrument [Line Items]            
Other Long-term Debt   674.2   691.6    
Amended Term Loan Facility | 2011 Term Loan            
Debt Instrument [Line Items]            
Other Long-term Debt   $ 660.3   $ 671.6