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Common Shares (Details) (USD $)
Share data in Millions, except Per Share data, unless otherwise specified
0 Months Ended 3 Months Ended 6 Months Ended
Apr. 25, 2014
Jun. 30, 2014
Jun. 30, 2014
Jun. 30, 2013
Common shares        
Issuance of common shares for stock options exercised (in shares)     2.9 0.3
Proceeds from stock options exercised     $ 29,000,000 $ 3,200,000
Common shares withheld by company     0.3 0.2
Common shares fair value     7,300,000 3,000,000
Common stock dividend declared (in dollars per share) $ 0.04      
Cash dividends paid   $ 11,900,000 $ 23,792,000 $ 23,552,000