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Long-Term Debt - Narrative (Details)
1 Months Ended 12 Months Ended 55 Months Ended
Jan. 09, 2019
USD ($)
Jul. 31, 2018
Rate
Dec. 07, 2017
USD ($)
Rate
Dec. 31, 2015
USD ($)
plant
Aug. 31, 2018
Rate
Mar. 31, 2019
USD ($)
Rate
Mar. 31, 2018
USD ($)
Mar. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Mar. 31, 2018
USD ($)
Debt Instrument [Line Items]                    
Proceeds from borrowings of debt           $ 270,800,000 $ 1,529,800,000 $ 1,606,400,000    
Gain (loss) on the extinguishment of debt           4,300,000 (11,900,000) (7,800,000)    
Amortization of deferred financing costs           1,500,000 1,900,000 2,400,000    
Direct costs           11,600,000        
Long-term debt, gross           $ 1,249,600,000        
Line of credit facility, unused capacity, daily aggregate commitment threshold of outstanding principal (less than) | Rate           50.00%        
Outstanding principal           $ 1,238,000,000 1,356,000,000     $ 1,356,000,000
Cash interest paid           $ 63,800,000 69,900,000 84,900,000    
Manufacturing Facility | North America                    
Debt Instrument [Line Items]                    
Number of plants | plant       2            
London Interbank Offered Rate (LIBOR)                    
Debt Instrument [Line Items]                    
Basis spread on variable rate | Rate           1.20%        
Maximum                    
Debt Instrument [Line Items]                    
Unused capacity, commitment fee percentage           0.50%        
Minimum                    
Debt Instrument [Line Items]                    
Unused capacity, commitment fee percentage | Rate           0.375%        
Other                    
Debt Instrument [Line Items]                    
Long-term debt, gross           $ 10,600,000 33,900,000     33,900,000
Term Refinancing Loan Facility | Term loans                    
Debt Instrument [Line Items]                    
Maximum borrowing capacity     $ 1,606,400,000.0     800,000,000.0        
Basis spread on variable rate | Rate   2.25%     2.00%          
Gain (loss) on the extinguishment of debt             (8,000,000)      
Revolving Credit Facility | Term loans                    
Debt Instrument [Line Items]                    
Maximum borrowing capacity           $ 264,000,000.0 264,000,000.0 $ 265,000,000.0   264,000,000.0
Covenant terms, company's ratio           2.2        
Unused capacity, commitment fee percentage | Rate           0.50%        
Long-term debt, gross           $ 0 0     0
Outstanding letters of credit           $ 5,600,000 8,300,000     8,300,000
Credit Facility | Term loans                    
Debt Instrument [Line Items]                    
Covenant terms, company's ratio | Rate           220.00%        
Long-term debt, voluntary prepayment $ 75,000,000                  
Loss on debt extinguishment to write off a portion of the unamortized debt issuance costs $ 700,000                  
Outstanding principal           $ 718,400,000 791,500,000     $ 791,500,000
Credit Facility | Term loans | Senior Secured Leverage Ratio (Numerator) | Maximum                    
Debt Instrument [Line Items]                    
Covenant terms, positive ratio           6.75        
Amended Term Refinancing Loan Facility | Term loans                    
Debt Instrument [Line Items]                    
Maximum borrowing capacity     $ 800,000,000.0              
LIBOR Floor, Scenario One     0.00%              
LIBOR Floor, Scenario Two | Rate     0.00%              
Weighted-average effective interest rate | Rate           4.49%        
Weighted average effective interest rate, over time                   4.30%
Gain (loss) on the extinguishment of debt             (11,900,000)      
Amortization of deferred financing costs             3,900,000      
Direct costs             800,000     $ 800,000
Amended Term Refinancing Loan Facility | Term loans | London Interbank Offered Rate (LIBOR), Scenario One                    
Debt Instrument [Line Items]                    
Basis spread on variable rate | Rate     2.25%              
Amended Term Refinancing Loan Facility | Term loans | Base Rate, Scenario One                    
Debt Instrument [Line Items]                    
Basis spread on variable rate | Rate     1.25%              
Amended Term Refinancing Loan Facility | Term loans | London Interbank Offered Rate (LIBOR), Scenario Two                    
Debt Instrument [Line Items]                    
Basis spread on variable rate | Rate     2.00%              
Amended Term Refinancing Loan Facility | Term loans | Base Rate, Scenario Two                    
Debt Instrument [Line Items]                    
Basis spread on variable rate | Rate     1.00%              
Senior notes | Term loans                    
Debt Instrument [Line Items]                    
Unamortized original issue discount           $ 6,600,000 8,500,000     8,500,000
Senior notes | 4.875% Senior notes due 2025                    
Debt Instrument [Line Items]                    
Proceeds from borrowings of debt     $ 500,000,000              
Direct costs           $ 6,000,000 6,000,000     6,000,000
Interest rate | Rate     4.875%     4.875%        
Redemption price, percentage | Rate     40.00%              
Percentage of principal amount redeemed | Rate     101.00%              
Restricted subsidiaries, amount     $ 50,000,000              
Unamortized original issue discount           $ 5,000,000 5,800,000     5,800,000
Outstanding principal           $ 495,000,000 494,200,000     494,200,000
Amended Credit Facility | Term loans | Senior Secured Leverage Ratio (Numerator) | Maximum                    
Debt Instrument [Line Items]                    
Transaction related costs             200,000     200,000
Term Loan Facility | Term loans                    
Debt Instrument [Line Items]                    
Positive ratio           1.5        
Term Loan Facility | Term loans | ABR Borrowings                    
Debt Instrument [Line Items]                    
Basis spread on variable rate | Rate           2.00%        
Term Loan Facility | Term loans | Eurocurrency Borrowings                    
Debt Instrument [Line Items]                    
Basis spread on variable rate | Rate           3.00%        
Other | Accounts Receivable Securitization Program                    
Debt Instrument [Line Items]                    
Maximum borrowing capacity           $ 100,000,000.0        
Long-term debt, gross           0 18,800,000     18,800,000
Outstanding letters of credit           7,100,000 7,900,000     7,900,000
Remaining borrowing capacity           100,000,000.0        
Unamortized original issue discount           500,000        
Outstanding principal           0 18,300,000     18,300,000
Other | New Market Tax Credit- Phase 2                    
Debt Instrument [Line Items]                    
Proceeds from borrowings of long-term debt       $ 9,800,000            
Other | New Market Tax Credit                    
Debt Instrument [Line Items]                    
Gain (loss) on the extinguishment of debt           5,000,000        
Payments to acquire loans receivable                 $ 27,600,000  
Loan receivable, terms                 30 years  
Loan receivable, stated percentage                 2.00%  
Forgiven associated loans           23,400,000        
Related loans receivable forgiven           17,900,000        
Unamortized original issue discount           500,000        
Outstanding principal           14,000,000        
Loans receivables           9,700,000        
Other | Other                    
Debt Instrument [Line Items]                    
Unamortized original issue discount           500,000        
Outstanding principal           $ 24,600,000 $ 52,000,000     $ 52,000,000