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External Debt and Financing Arrangements - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Debt Instrument [Line Items]      
Revolving credit facility, maximum borrowing capacity $ 650 $ 650  
Term loan 350 350  
Revolving credit facility, extended expiration date 2018-07    
Term loan, extended expiration date 2018-07    
Term loan, outstanding borrowings 350.0 320.0  
Credit facility, minimum Consolidated Interest Coverage Ratio 3.0    
Increase Maximum Leverage Ratio 3.75    
Notes payable to banks 6.0 5.5  
Uncommitted bank lines of credit, which provide for unsecured borrowings for working capital 22.7 22.7  
Weighted-average interest rates on borrowings 12.30% 13.00% 14.30%
Term loan amortization payments in 2014 0    
Term loan amortization payments in 2015 17.5    
Term loan amortization payments in 2016 35.0    
Term loan amortization payments in 2017 35.0    
Term loan amortization payments in 2018 $ 262.5    
Debt To Ebitda Ratio
     
Debt Instrument [Line Items]      
Credit facility, maximum Leverage Ratio 3.5    
LIBOR | Minimum
     
Debt Instrument [Line Items]      
Interest rate over LIBOR 1.00%    
LIBOR | Maximum
     
Debt Instrument [Line Items]      
Interest rate over LIBOR 2.00%