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Discontinued Operations - Earnings Per Share (Details) - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Income (Loss) Allocated to Participating Unvested Restricted Common Shares $ (0.1) $ (1.2) $ (0.9) $ (2.3)
Net Income (Loss) Available to Common Stockholders, Basic $ 4.3 $ 95.5 $ 88.6 $ 191.0
Total average common shares outstanding during the period 5,985,700 6,162,200 5,982,100 6,166,000
Weighted Average Number of Shares, Restricted Stock (71,400) (81,300) (65,200) (75,900)
Basic earnings per share denominator 5,914,300 6,080,900 5,916,900 6,090,100
Average outstanding dilutive options to acquire common shares 0 0 0 0
Diluted earnings (loss) per share denominator 5,914,300 6,080,900 5,916,900 6,090,100
Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements 125,000     125,000
Segment, Discontinued Operations        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Net loss from discontinued operations, net of tax $ (0.3) $ 2.6 $ 7.6 $ 2.1
Income (Loss) Allocated to Participating Unvested Restricted Common Shares 0.0 0.0 (0.1) 0.0
Net Income (Loss) Available to Common Stockholders, Basic $ (0.3) $ 2.6 $ 7.5 $ 2.1
Total average common shares outstanding during the period 5,985,700 6,162,200 5,982,100 6,166,000
Weighted Average Number of Shares, Restricted Stock (71,400) (81,300) (65,200) (75,900)
Basic earnings per share denominator 5,914,300 6,080,900 5,916,900 6,090,100
Average outstanding dilutive options to acquire common shares 0 0 0 0
Diluted earnings (loss) per share denominator 5,914,300 6,080,900 5,916,900 6,090,100
Earnings Per Share, Basic and Diluted $ (0.04) $ 0.43 $ 1.27 $ 0.34
Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements       125,000