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Income Taxes (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Current:      
Federal $ 159.1 $ 153.1 $ 40.3
State 26.5 22.1 12.2
Foreign 12.7 14.4 3.4
Total 198.3 189.6 55.9
Deferred:      
Federal 2.5 (24.1) 34.0
State 0.5 (2.3) 7.9
Foreign (0.2) (0.8) 0.8
Total 2.8 (27.2) 42.7
Income tax provision 201.1 162.4 98.6
Components of U.S. and international income (loss) before income taxes      
US 551.6 452.0 275.8
International 57.8 59.6 20.7
Income before income taxes 609.4 511.6 296.5
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) 35.00% 35.00% 35.00%
State income tax, net of federal tax effect (as a percent) 2.90% 2.40% 3.90%
Net effect of life insurance policies (as a percent) (2.20%) (2.30%) (2.60%)
Net effect of changes in unrecognized tax benefits (as a percent)     (0.10%)
Domestic production activity deduction (as a percent) (1.20%) (1.50%) (1.20%)
Other, net (as a percent) (1.50%) (1.90%) (1.70%)
Effective tax rate (as a percent) 33.00% 31.70% 33.30%
Deferred tax assets:      
Accrued expenses not currently deductible for tax 66.9 45.7  
Inventory costs capitalized for tax purposes 25.8 24.7  
Share-based compensation 21.1 20.2  
Allowance for doubtful accounts 7.8 9.3  
Tax credit carryforwards 1.1 1.1  
Net operating loss carryforwards 3.4 3.1  
Other 3.5 3.9  
Total deferred tax assets 129.6 108.0  
Deferred tax liabilities:      
Property, plant and equipment, net (165.9) (154.1)  
Goodwill and other intangible assets (360.9) (342.9)  
LIFO inventories (38.6) (17.5)  
Total deferred tax liabilities (565.4) (514.5)  
Net deferred tax liabilities $ (435.8) $ (406.5)