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External Debt and Financing Arrangements - Additional Information (Detail) - USD ($)
$ in Millions
1 Months Ended 12 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Mar. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Debt Instrument [Line Items]            
Aggregate outstanding notes       $ 2,200.0    
Repayment of long-term debt       1,345.0 $ 1,890.0 $ 565.0
Term loan maturity period     2019-03      
Uncommitted bank lines of credit, which provide for unsecured borrowings for working capital       $ 17.5 $ 23.5  
Weighted-average interest rates on borrowings       0.00% 0.00%  
Term Loan Facility [Member]            
Debt Instrument [Line Items]            
Senior unsecured notes, price $ 350.0          
Repayment of long-term debt 350.0          
Term loan maturity period       2020-03    
Term loan, outstanding borrowings       $ 0.0 $ 525.0  
Debt instrument, description       In September 2019, the Company used the proceeds from the 2019 Notes to repay the full outstanding balance on the Term Loan entered into in March 2018 and subsequently amended in August 2018 and March 2019 (the “Term Loan”). Following the March 2019 amendment, the Term Loan provided for borrowings of $350 million and was scheduled to mature in March 2020.    
2019 Senior Notes [Member] | Notes due 2029 [Member]            
Debt Instrument [Line Items]            
Senior unsecured notes, price $ 700.0          
Senior unsecured notes, maturity year 2029          
Senior unsecured notes, coupon rate 3.25%          
2018 Senior Notes [Member] | Notes due 2023 [Member]            
Debt Instrument [Line Items]            
Senior unsecured notes, price   $ 600.0        
Senior unsecured notes, maturity year   2023        
Senior unsecured notes, coupon rate   4.00%        
Senior Notes [Member]            
Debt Instrument [Line Items]            
Senior unsecured notes, price       $ 2,200.0    
Long-term debt payments in 2020       400.0    
Long-term debt payments in 2021       0.0    
Long-term debt payments in 2022       0.0    
Long-term debt payments in 2023       600.0    
Long-term debt payments in 2023 through 2024       $ 600.0    
2019 Revolving Credit Agreement [Member]            
Debt Instrument [Line Items]            
Line of Credit Facility, Maximum Borrowing Capacity $ 1,250.0          
Term loan maturity period       2024-09    
Rollover amount from prior credit facility included in current facility       $ 165.0    
Debt Instrument, Description of Variable Rate Basis       Interest rates under the 2019 Revolving Credit Agreement are variable based on LIBOR at the time of the borrowing and the Company’s long-term credit rating and can range from LIBOR + 0.91% to LIBOR + 1.4%.    
Debt instrument, covenant description       The amendment also includes a covenant under which the Company is required to maintain a minimum ratio of consolidated EBITDA to consolidated interest expense of 3.0 to 1.0.  Adjusted EBITDA is defined as consolidated net income before interest expense, income taxes, depreciation, amortization of intangible assets, losses from asset impairments, and certain other one-time adjustments. In addition, the amendment includes a covenant under which the Company’s ratio of consolidated debt minus certain cash and cash equivalents to consolidated EBITDA generally may not exceed 3.5 to 1.0.    
Required minimum ratio of consolidated EBITDA to consolidated interest expense       3.0    
Ratio of consolidated debt minus certain cash and cash equivalents to consolidated EBITDA       3.5    
Term loan, outstanding borrowings       $ 0.0 $ 320.0  
2019 Revolving Credit Agreement [Member] | LIBOR [Member] | Minimum [Member]            
Debt Instrument [Line Items]            
Interest rate over LIBOR       0.91%    
2019 Revolving Credit Agreement [Member] | LIBOR [Member] | Maximum [Member]            
Debt Instrument [Line Items]            
Interest rate over LIBOR       1.40%