Quarterly report pursuant to Section 13 or 15(d)

Income Taxes (Details)

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Income Taxes (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 6 Months Ended
Mar. 31, 2012
Dec. 31, 2011
Mar. 31, 2011
Mar. 31, 2012
Mar. 31, 2011
Reconciliation of the effective income tax rate with the U.S. federal statutory income tax rate          
Federal statutory rates (as a percent) 35.00%   35.00% 35.00% 35.00%
Adjustments:          
Permanent reinvestment of unremitted earnings (as a percent)       (15.50%)  
State and local income taxes, net of federal benefit (as a percent) 2.40%   3.30% 2.50% 3.30%
Foreign income tax rate differential (as a percent) (2.30%)   (1.40%) (2.20%) (1.20%)
Domestic manufacturer's deduction (as a percent) (2.50%)   (2.40%) (2.50%) (2.40%)
Unrecognized tax benefits (as a percent) (0.70%)   (0.20%) (0.90%) 0.40%
Other, net (as a percent) 0.80%   0.40% 0.60% 0.10%
Effective income tax rate (as a percent) 32.70%   34.70% 17.00% 35.20%
Tax benefit recognized representing full release of previously recorded deferred tax liability   $ 10.4      
Activity within the reserve for unrecognized tax benefits          
Balance at the beginning of the period   7.3   7.3  
Additions for tax positions for the current year       0.1  
Additions for tax positions of prior years       0.1  
Reductions for tax positions of prior years       (1.5)  
Settlements       (0.5)  
Balance at the end of the period 5.5     5.5  
Other amounts accrued for interest and penalties $ 1.6     $ 1.6