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DISCONTINUED OPERATIONS AND ASSETS AND LIABILITIES HELD FOR SALE - Gain (Loss) on Disposition of Discontinued Operations (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Discontinued operations in the Consolidated Statement of Comprehensive Income    
Gain (loss) on disposition of discontinued operations – net of tax $ 2.7 $ 55.7
Discontinued Operations, Disposed of by Sale    
Discontinued operations in the Consolidated Statement of Comprehensive Income    
Gain (loss) on disposition of discontinued operations   83.0
(Provision for) benefit from income taxes   (27.3)
Gain (loss) on disposition of discontinued operations – net of tax   55.7
Discontinued Operations, Disposed of by Sale | MHPS    
Discontinued operations in the Consolidated Statement of Comprehensive Income    
Gain (loss) on disposition of discontinued operations   79.5
(Provision for) benefit from income taxes   (26.8)
Gain (loss) on disposition of discontinued operations – net of tax   52.7
Discontinued Operations, Disposed of by Sale | Atlas    
Discontinued operations in the Consolidated Statement of Comprehensive Income    
Gain (loss) on disposition of discontinued operations 3.2 3.5
(Provision for) benefit from income taxes (0.5) (0.5)
Gain (loss) on disposition of discontinued operations – net of tax $ 2.7 $ 3.0