Quarterly report pursuant to Section 13 or 15(d)

Shareholders' Equity (Narrative) (Details)

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Shareholders' Equity (Narrative) (Details) (USD $)
In Millions, except Share data, unless otherwise specified
0 Months Ended 3 Months Ended 6 Months Ended 34 Months Ended
Sep. 03, 2014
Jun. 18, 2014
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Sep. 27, 2011
Jul. 16, 2014
Share Repurchase Program [Domain]
Stockholders' Equity Note [Abstract]                
Shares authorized under share repurchase program             10,000,000  
Share repurchased and retired         931,000      
Value of shares repurchased and retired         $ 51.0     $ 451.0
Outstanding common stock acquired, average price         $ 54.76     $ 45.10
Dividends paid (usd per share)   $ 0.25            
Dividends declared per share $ 0.25   $ 0.25 $ 0.18 $ 0.50 $ 0.36    
Subsequent Event [Line Items]                
Value of shares repurchased and retired         $ 51.0     $ 451.0
Outstanding common stock acquired, average price         $ 54.76     $ 45.10