Quarterly report pursuant to Section 13 or 15(d)

Shareholders' Equity (Details)

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Shareholders' Equity (Details) (USD $)
In Millions, except Per Share data, unless otherwise specified
0 Months Ended 3 Months Ended 0 Months Ended 1 Months Ended
Feb. 21, 2013
Mar. 31, 2013
Mar. 31, 2012
Sep. 27, 2011
May 02, 2013
Subsequent Event [Member]
May 02, 2013
Subsequent Event [Member]
Stockholders' Equity Note [Abstract]            
Shares authorized under share repurchase program       10    
Dividends paid (usd per share) $ 0.18          
Subsequent Event [Line Items]            
Share repurchased and retired   1.2 1.1     0.7
Value of shares repurchased and retired   $ 65.3 $ 41.3     $ 39.6
Outstanding common stock acquired, average price   $ 53.80 $ 36.73     $ 52.80
Dividends declared per common share (usd per share)   $ 0.18 $ 0.125   $ 0.18