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Income Taxes - Summary, Reconciliation and Other (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Current:        
Federal   $ 117.8 $ 91.1 $ 129.5
State   21.5 18.9 21.3
Foreign   16.1 10.6 8.8
Total   155.4 120.6 159.6
Deferred:        
Federal   (202.8) 3.0 (11.7)
State   11.1 1.0 (4.5)
Foreign   (0.9) (4.5) (0.9)
Total   (192.6) (0.5) (17.1)
Income tax provision   (37.2) 120.1 142.5
Components of U.S. and international income before income taxes        
US   524.6 411.0 427.3
International   59.2 18.2 31.4
Income before income taxes   $ 583.8 $ 429.2 $ 458.7
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% 35.00% 35.00% 35.00%
Tax reform (as a percent)   (35.50%)    
State income tax, net of federal tax effect (as a percent)   3.80% 3.10% 2.00%
Foreign earnings taxed at lower rates   (0.70%) (0.80%) (0.80%)
Net effect of life insurance policies (as a percent)   (3.60%) (4.20%) (3.60%)
Net effect of changes in unrecognized tax benefits (as a percent)   (0.20%) (4.30%) 0.70%
Domestic production activity deduction (as a percent)   (1.60%) (1.70%) (2.00%)
Loss on sale of assets (as a percent)   (0.80%)    
Other, net (as a percent)   (2.80%) 0.90% (0.20%)
Effective tax rate (as a percent)   (6.40%) 28.00% 31.10%
Deferred tax assets:        
Accrued expenses not currently deductible for tax   $ 34.8 $ 77.6  
Inventory costs capitalized for tax purposes   23.1 29.2  
Share-based compensation   10.5 12.0  
Allowance for doubtful accounts   3.4 5.3  
Tax credits carryforwards   1.3 1.3  
Net operating loss carryforwards   5.6 4.7  
Total deferred tax assets   78.7 130.1  
Deferred tax liabilities:        
Property, plant and equipment, net   (159.7) (238.6)  
Goodwill and other intangible assets   (307.3) (451.2)  
LIFO inventories   (39.5) (54.1)  
Deferred income   (0.8) (7.1)  
Other   (12.2) (6.0)  
Total deferred tax liabilities   (519.5) (757.0)  
Net deferred tax liabilities   (440.8) $ (626.9)  
Tax Cuts and Jobs Act of 2017        
Effect of tax rate changes on deferred tax assets and liabilities   216.7    
Repatriation and related liabilities   (9.4)    
Tax benefit, net   $ 207.3