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DISCONTINUED OPERATIONS - Gain (Loss) on Disposition of Discontinued Operations (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Discontinued operations in the Consolidated Statement of Comprehensive Income        
Gain (loss) on disposition of discontinued operations – net of tax $ 0.2 $ 2.6 $ 4.8 $ 63.7
Discontinued Operations, Disposed of by Sale        
Discontinued operations in the Consolidated Statement of Comprehensive Income        
Gain (loss) on disposition of discontinued operations (0.2) 2.8 2.4 85.8
(Provision for) benefit from income taxes 0.4 (0.2) 2.4 (22.1)
Gain (loss) on disposition of discontinued operations – net of tax 0.2 2.6 4.8 63.7
Discontinued Operations, Disposed of by Sale | MHPS        
Discontinued operations in the Consolidated Statement of Comprehensive Income        
Gain (loss) on disposition of discontinued operations (0.2) 2.8 (0.8) 82.3
(Provision for) benefit from income taxes 0.0 (0.2) 0.1 (21.6)
Gain (loss) on disposition of discontinued operations – net of tax (0.2) 2.6 (0.7) 60.7
Discontinued Operations, Disposed of by Sale | Atlas        
Discontinued operations in the Consolidated Statement of Comprehensive Income        
Gain (loss) on disposition of discontinued operations 0.0 0.0 3.2 3.5
(Provision for) benefit from income taxes 0.0 0.0 (0.5) (0.5)
Gain (loss) on disposition of discontinued operations – net of tax 0.0 $ 0.0 2.7 $ 3.0
Discontinued Operations, Disposed of by Sale | Other        
Discontinued operations in the Consolidated Statement of Comprehensive Income        
Gain (loss) on disposition of discontinued operations 0.0   0.0  
(Provision for) benefit from income taxes 0.4   2.8  
Gain (loss) on disposition of discontinued operations – net of tax $ 0.4   $ 2.8