DERIVATIVES (DERIVATIVES WITH MASTER NETTING ARRANGEMENTS) (Details) - USD ($) $ in Millions	Dec. 31, 2016	Dec. 31, 2015
Equity Contract [Member]
Derivative [Line Items]
Gross amounts recognized	$ 111.9	$ 41.0
Gross amounts offset in the balance sheet	0.0	0.0
Net amounts of assets presented in the balance sheet	111.9	41.0
Financial instruments	0.0	0.0
Cash collateral received	0.0	0.0
Net amount	111.9	41.0
Interest Rate Contract [Member]
Derivative [Line Items]
Gross amounts recognized	0.0	0.1
Gross amounts offset in the balance sheet	0.0	1.5
Net amounts of assets presented in the balance sheet	0.0	1.6
Financial instruments	0.0	0.0
Cash collateral received	0.0	0.0
Net amount	$ 0.0	$ 1.6