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Income from Continuing Operations Per Unrestricted Share (Details) (USD $)
In Millions, except Share data, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Schedule of Basic and Diluted Earnings Per Share [Line Items]        
Income from Continuing Operations $ 32.5 $ 1.6 $ 91.1 $ 37.9
Dilutive Effect on Income of Equity-based Compensation Equivalent Shares 0 0 0 0
Diluted Income from Continuning Operations Attributed to Unrestricted Shares 32.3 1.6 90.6 37.7
Weighted-Average Unrestricted Shares Outstanding 57,519,000 59,196,700 57,824,700 59,531,200
Equity-based Compensation Equivalent Shares 110,400 137,500 110,400 133,900
Weighted-Average Unrestricted Shares and Equivalent Shares Outstanding Assuming Dilution 57,629,400 59,334,200 57,935,100 59,665,100
Basic Income from Continuing Operations Per Unrestricted Share $ 0.56 $ 0.03 $ 1.57 $ 0.63
Diluted Income from Continuing Operations Per Untrestriced Share $ 0.56 $ 0.03 $ 1.57 $ 0.63
Restricted Shares [Member]
        
Schedule of Basic and Diluted Earnings Per Share [Line Items]        
Income from Continuing Operations 0.2 0 0.5 0.2
Unrestricted Shares [Member]
        
Schedule of Basic and Diluted Earnings Per Share [Line Items]        
Income from Continuing Operations $ 32.3 $ 1.6 $ 90.6 $ 37.7