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External Debt and Financing Arrangements - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
3 Months Ended 9 Months Ended 9 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Dec. 31, 2013
Sep. 30, 2014
JPMorgan Chase & Co.
Sep. 30, 2014
JPMorgan Chase Bank, N.A., a subsidiary of JPM
Sep. 30, 2014
JPMorgan Investment Management, Inc., another subsidiary of JPM
Sep. 30, 2014
LIBOR
Minimum
Sep. 30, 2014
LIBOR
Maximum
Aug. 31, 2014
Prior Credit Agreement [Member]
Aug. 31, 2014
Amended Credit Agreement
Sep. 30, 2014
Revolving Credit Facility
Dec. 31, 2013
Revolving Credit Facility
Sep. 30, 2014
Term Loan Facilities
Dec. 31, 2013
Term Loan Facilities
Debt Instrument [Line Items]                                
Revolving credit facility, maximum borrowing capacity                     $ 1,000 $ 1,500 $ 975   $ 525  
Revolving credit facility, extended expiration date     2018-07                          
Term loan, extended expiration date     2018-07                          
Term loan, outstanding borrowings                         680.0 680.0 350.0 350.0
Interest rate over LIBOR                 1.00% 2.00%            
Notes payable to banks 3.5   3.5   6.0                      
Uncommitted bank lines of credit, which provide for unsecured borrowings for working capital 15.7   15.7   22.7                      
Weighted-average interest rates on borrowings 12.20% 12.50% 8.20% 12.40%                        
Ownership percentage           12.00%                    
Total debt under credit facilities 680.0   680.0   350.0   56.4                  
Cash balances             0.4                  
Pension assets               $ 24.4