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External Debt and Financing Arrangements - Additional Information (Detail) - USD ($)
$ in Millions
1 Months Ended 6 Months Ended
Sep. 30, 2018
Mar. 31, 2018
Jun. 30, 2015
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Aug. 31, 2018
Jun. 30, 2016
Debt Instrument [Line Items]                
Term loan maturity period   2019-03            
Uncommitted bank lines of credit, which provide for unsecured borrowings for working capital       $ 23.5   $ 23.5    
Uncommitted bank lines of credit, which provide for unsecured borrowings for working capital amount outstanding       $ 0.0   0.0    
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 Facility [Member]                
Debt Instrument [Line Items]                
Senior unsecured notes, price   $ 350.0     $ 350.0   $ 525.0  
Term loan maturity period       2020-03        
Term loan, outstanding borrowings       $ 350.0   525.0    
Debt instrument, description       In March 2018, the Company entered into a $350 million term loan for general corporate purposes scheduled to mature in March 2019. In August 2018, the Company amended its existing $350 million term loan to increase the borrowings under the term loan from $350 million to $525 million.  In March 2019, the Company amended the $525 million term loan to decrease the borrowings from $525 million to $350 million and extend the maturity date to March 2020.  All other terms and conditions on the amended term loan remain the same as the previous $525 million term loan.        
Debt Instrument, Description of Variable Rate Basis       Interest rates under the term loan are variable based on LIBOR at the time of the borrowing and the Company’s long-term credit rating and can range from LIBOR + 0.625% to LIBOR + 1.25%.        
Revolving Credit Facility [Member]                
Debt Instrument [Line Items]                
Term loan, outstanding borrowings       $ 575.0   320.0    
Line of Credit Facility, Maximum Borrowing Capacity       1,250.0        
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, outstanding amount       595.5   595.0    
2015 Senior Notes [Member]                
Debt Instrument [Line Items]                
Senior unsecured notes, price     $ 900.0          
Senior notes, outstanding amount       $ 894.8   $ 894.0    
2015 Senior Notes [Member] | Notes Due 2020 [Member]                
Debt Instrument [Line Items]                
Senior unsecured notes, price     $ 400.0          
Senior unsecured notes, maturity year     2020          
Senior unsecured notes, coupon rate     3.00%          
Senior unsecured notes, maturity period     5 years          
2015 Senior Notes [Member] | Notes Due 2025 [Member]                
Debt Instrument [Line Items]                
Senior unsecured notes, price     $ 500.0          
Senior unsecured notes, maturity year     2025          
Senior unsecured notes, coupon rate     4.00%          
Senior unsecured notes, maturity period     10 years          
Amended and Restated Credit Agreement [Member]                
Debt Instrument [Line Items]                
Line of Credit Facility, Maximum Borrowing Capacity               $ 1,250.0