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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, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Schedule of Basic and Diluted Earnings Per Share [Line Items]        
Income from Continuing Operations $ 9.3 $ 32.5 $ 44.5 $ 91.1
Dilutive Effect on Income of Equity-based Compensation Equivalent Shares 0 0 0 0
Diluted Income from Continuning Operations Attributed to Unrestricted Shares 9.3 32.3 44.3 90.6
Weighted-Average Unrestricted Shares Outstanding 54,666,500 57,519,000 54,989,700 57,824,700
Equity-based Compensation Equivalent Shares 106,600 110,400 118,400 110,400
Weighted-Average Unrestricted Shares and Equivalent Shares Outstanding Assuming Dilution 54,773,100 57,629,400 55,108,100 57,935,100
Basic Income from Continuing Operations Per Unrestricted Share (in dollars per share) $ 0.17 $ 0.56 $ 0.80 $ 1.57
Diluted Income from Continuing Operations Per Untrestriced Share (in dollars per share) $ 0.17 $ 0.56 $ 0.80 $ 1.57
Unrestricted Shares [Member]
       
Schedule of Basic and Diluted Earnings Per Share [Line Items]        
Income from Continuing Operations 9.3 32.3 44.3 90.6
Participating Awards [Member]
       
Schedule of Basic and Diluted Earnings Per Share [Line Items]        
Income from Continuing Operations $ 0 $ 0.2 $ 0.2 $ 0.5