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Income Taxes - Summary, Reconciliation and Other (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Current:        
Federal $ 77.6 $ 136.3 $ 150.6  
State 24.9 37.9 47.6  
Foreign and withholding taxes 17.0 16.5 19.7  
Total 119.5 190.7 217.9  
Deferred:        
Federal (7.1) 26.9 (6.0)  
State 0.3 7.2 (2.3)  
Foreign (6.9) (1.6) (0.8)  
Total (13.7) 32.5 (9.1)  
Income tax provision 105.8 223.2 208.8  
Components of U.S. and international income before income taxes        
US 465.9 877.4 775.2  
International 12.3 51.9 75.4  
Income before income taxes $ 478.2 $ 929.3 $ 850.6  
Reconciliation of income tax at the U.S. federal statutory tax rates to income tax expense        
Income tax at U.S. federal statutory tax rate (as a percent) 21.00% 21.00% 21.00% 35.00%
Tax Reform (as a percent)     0.40%  
State income tax, net of federal tax effect (as a percent) 3.60% 3.60% 3.60%  
Foreign earnings taxed at higher rates (as a percent) 1.00% 0.40% 0.40%  
Net effect of life insurance policies (as a percent) (2.90%) (1.50%) (1.50%)  
Net effect of changes in unrecognized tax benefits (as a percent) (0.30%)   (0.20%)  
Stock-based compensation (as a percent) 0.80% 0.70% 0.60%  
Other, net (as a percent) (1.10%) (0.20%) 0.20%  
Effective tax rate (as a percent) 22.10% 24.00% 24.50%  
Deferred tax assets:        
Accrued expenses not currently deductible for tax $ 42.3 $ 31.6    
Inventory costs capitalized for tax purposes 9.0 13.1    
Share-based compensation 8.6 8.2    
Allowance for doubtful accounts 4.8 4.9    
Tax credits carryforwards 0.4 1.4    
Net operating loss carryforwards 3.6 4.2    
Total deferred tax assets 68.7 63.4    
Deferred tax liabilities:        
Property, plant and equipment, net (190.2) (189.1)    
Goodwill and other intangible assets (297.1) (311.6)    
LIFO inventories (29.7) (23.2)    
Other (7.3) (8.8)    
Total deferred tax liabilities (524.3) (532.7)    
Net deferred tax liabilities (455.6) $ (469.3)    
Tax Cuts and Jobs Act of 2017        
Tax benefit, net     $ 3.2  
State        
Income Taxes        
Operating Loss Carryforwards 3.5      
Federal        
Income Taxes        
Operating Loss Carryforwards $ 0.8