Quarterly report pursuant to Section 13 or 15(d)

Significant Accounting Policies (Narrative) (Details)

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Significant Accounting Policies (Narrative) (Details) (USD $)
In Millions
1 Months Ended
Aug. 31, 2010
Jun. 30, 2011
Dec. 31, 2010
Significant Accounting Policies      
Company-owned life insurance contracts   $ 27.2 $ 25.8
Senior notes, fair value   $ 266.3 $ 212.3
Common stock split description shareholders received one additional share of common stock for every two shares owned.