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Common Shares (Narrative) (Details) (USD $)
In Millions, except Share data, unless otherwise specified
 3 Months Ended 6 Months Ended 1 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Dec. 31, 2013
May 31, 2012
2012 ATM Program [Member]
Jun. 30, 2014
Employee Stock Option [Member]
Allocated Share-based Compensation Expense $ 4.2 $ 3.9 $ 8.0 $ 7.3     $ 0.3
Maximum aggregate offering price of common shares           $ 300  
Number of common and preferred stock authorized to issue 185,000,000   185,000,000        
Common shares, authorized 175,000,000   175,000,000   175,000,000    
Preferred shares, authorized 10,000,000   10,000,000        
Common Stock, Shares, Outstanding 85,600,000   85,600,000        
Preferred Stock, Shares Outstanding 0   0