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External Debt and Financing Arrangements - Additional Information (Detail) - USD ($)
1 Months Ended 9 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Sep. 30, 2016
Dec. 31, 2015
Sep. 30, 2015
Debt Instrument [Line Items]          
Revolving credit facility, extended expiration date     2021-06    
Current portion of long-term debt     $ 0 $ 0  
Prepaid debt issuance cost, write off $ 1,300,000        
Uncommitted bank lines of credit, which provide for unsecured borrowings for working capital     25,700,000   $ 0
Uncommitted bank lines of credit, which provide for unsecured borrowings for working capital amount outstanding     $ 0 800,000  
Restatement Adjustment | Accounting Standards Update 2015-03 | Other Current Assets and Other Assets          
Debt Instrument [Line Items]          
Debt Issuance Costs, Line of Credit Arrangements       (3,000,000)  
Restatement Adjustment | Accounting Standards Update 2015-03 | Long-term Debt          
Debt Instrument [Line Items]          
Debt Issuance Costs, Line of Credit Arrangements       3,000,000  
LIBOR [Member] | Minimum [Member]          
Debt Instrument [Line Items]          
Interest rate over LIBOR     0.90%    
LIBOR [Member] | Maximum [Member]          
Debt Instrument [Line Items]          
Interest rate over LIBOR     1.50%    
Term Loan Facilities [Member]          
Debt Instrument [Line Items]          
Term loan, outstanding borrowings     $ 695,000,000 279,000,000  
Senior Unsecured Notes [Member]          
Debt Instrument [Line Items]          
Senior unsecured notes, price   $ 900,000,000      
Senior notes, outstanding amount     $ 890,800,000 $ 889,700,000  
Senior Unsecured Notes [Member] | Notes Due 2020 [Member]          
Debt Instrument [Line Items]          
Senior unsecured notes, price   $ 400,000,000      
Senior unsecured notes, maturity period   5 years      
Senior unsecured notes, maturity year   2020      
Senior unsecured notes, coupon rate   3.00%      
Senior Unsecured Notes [Member] | Notes Due 2025 [Member]          
Debt Instrument [Line Items]          
Senior unsecured notes, price   $ 500,000,000      
Senior unsecured notes, maturity period   10 years      
Senior unsecured notes, maturity year   2025      
Senior unsecured notes, coupon rate   4.00%      
Amended and Restated Credit Agreement [Member] | Revolving Credit Facility [Member]          
Debt Instrument [Line Items]          
Line of Credit Facility, Maximum Borrowing Capacity $ 1,250,000,000