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Credit Facilities and Lease Obligations - Additional Information (Details) - USD ($)
 1 Months Ended 3 Months Ended 5 Months Ended 6 Months Ended 12 Months Ended
May 31, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Dec. 31, 2018
Sep. 30, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Nov. 30, 2018
May 31, 2018
Disclosure of detailed information about borrowings [line items]                          
Borrowings, notional amount     $ 544,200,000     $ 544,200,000     $ 523,900,000 $ 544,200,000      
Letters of credit outstanding     14,400,000     14,400,000     13,300,000 14,400,000      
Stock repurchase program, excess share repurchase amount $ 17,000,000                        
Uncommitted bank overdraft facilities     132,800,000     132,800,000     142,500,000 132,800,000      
Amounts outstanding under overdraft facilities     0     $ 0     0 0      
Interest rate risk                          
Disclosure of detailed information about borrowings [line items]                          
Hedging instrument, term           5 years              
New credit facility                          
Disclosure of detailed information about borrowings [line items]                          
Borrowings, notional amount         $ 800,000,000.0                
Amount of accordion feature                 110,000,000        
Proceeds from borrowings                 48,000,000 759,000,000 $ 0    
Repayments of borrowings                 $ 213,000,000 1,700,000 0    
New credit facility | Bottom of range                          
Disclosure of detailed information about borrowings [line items]                          
Repayments of borrowings, percentage of excess cash flow (percent)                 0.00%        
New credit facility | Top of range                          
Disclosure of detailed information about borrowings [line items]                          
Repayments of borrowings, percentage of excess cash flow (percent)                 50.00%        
Term Loans                          
Disclosure of detailed information about borrowings [line items]                          
Repayments of borrowings                 $ 1,500,000        
Repayments of current borrowings                 6,000,000        
Initial Term Loan                          
Disclosure of detailed information about borrowings [line items]                          
Borrowings, notional amount         $ 350,000,000.0                
Repayments of borrowings                 875,000        
Repayments of current borrowings                   1,700,000      
Initial Term Loan | London Interbank Offered Rate LIBOR                          
Disclosure of detailed information about borrowings [line items]                          
Margin for borrowings (percent)         2.125%                
Initial Term Loan | Interest rate risk                          
Disclosure of detailed information about borrowings [line items]                          
Hedged item, liabilities     175,000,000     $ 175,000,000       175,000,000      
Incremental Term Loan                          
Disclosure of detailed information about borrowings [line items]                          
Amount of accordion feature                       $ 250,000,000.0  
Repayments of borrowings                 625,000        
Incremental Term Loan | London Interbank Offered Rate LIBOR                          
Disclosure of detailed information about borrowings [line items]                          
Margin for borrowings (percent)                       2.50%  
Incremental Term Loan | Interest rate risk                          
Disclosure of detailed information about borrowings [line items]                          
Hedged item, liabilities     350,000,000     350,000,000       350,000,000      
Revolver                          
Disclosure of detailed information about borrowings [line items]                          
Line of credit, maximum borrowing capacity         $ 450,000,000.0                
Amount of accordion feature                 110,000,000        
Proceeds from borrowings   $ 48,000,000 339,500,000 $ 55,000,000                  
Repayments of borrowings   $ 110,000,000 245,000,000       $ 97,000,000            
Letters of credit outstanding     $ 21,300,000   $ 150,000,000.0 $ 21,300,000     21,200,000 21,300,000      
Uncommitted bank overdraft facilities                 $ 428,800,000        
Revolver | Bottom of range                          
Disclosure of detailed information about borrowings [line items]                          
Margin for borrowings (percent)         0.75%                
Commitment fees (percent)         0.35%                
Revolver | Top of range                          
Disclosure of detailed information about borrowings [line items]                          
Margin for borrowings (percent)         2.50%                
Commitment fees (percent)         0.50%                
Revolver | Bridge Loan                          
Disclosure of detailed information about borrowings [line items]                          
Line of credit, maximum borrowing capacity         $ 50,000,000.0                
Revolver | Bridge Loan | Top of range                          
Disclosure of detailed information about borrowings [line items]                          
Debt instrument term                 10 days        
Prior credit facility                          
Disclosure of detailed information about borrowings [line items]                          
Proceeds from borrowings                 $ 0 163,000,000 0    
Repayments of borrowings                 $ 0 350,500,000 $ 40,000,000    
Prior Revolving Facility                          
Disclosure of detailed information about borrowings [line items]                          
Line of credit, maximum borrowing capacity                         $ 300,000,000.0
Proceeds from borrowings         163,000,000                
Repayments of borrowings         163,000,000                
Prior Term Loan                          
Disclosure of detailed information about borrowings [line items]                          
Borrowings, notional amount                         $ 250,000,000.0
Repayments of borrowings         $ 175,000,000                
Repayments of current borrowings                   $ 12,500,000      
Forecast | Incremental Term Loan                          
Disclosure of detailed information about borrowings [line items]                          
Repayments of borrowings               $ 107,000,000