CONSOLIDATED STATEMENT OF CASH FLOW (Details) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
	Sep. 27, 2018	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Cash flows from operating activities:
Net income (loss)		$ (529.8)	$ 100.8	$ (343.3)	$ 246.5
Adjustments to reconcile net income (loss) to net cash from operating activities:
Amortization and depreciation				216.1	200.8
Income taxes				10.5	50.6
Insurance liabilities				209.1	321.5
Accrual and amortization of investment income				(117.9)	(214.2)
Deferral of policy acquisition costs				(187.2)	(183.4)
Net realized investment gains				(27.0)	(52.3)
Net Realized Gains On The Transfer Of Assets Related To Reinsurance Transaction, Excluding Cash Expenses				(363.4)	0.0
Loss related to reinsurance transaction				1,067.6	0.0
Payment to reinsurer pursuant to long-term care business reinsured				(365.0)	0.0
Loss on extinguishment of borrowings related to variable interest entities		0.0	5.5	3.8	5.5
Other				11.7	74.5
Net cash flow from operating activities				115.0	449.5
Investments transferred	$ (3,582.1)
Cash paid to reinsurer	(365.0)
Accrued interest on investments transferred	(51.6)
Present value of future profits and deferred acquisition costs written-off	(61.6)
Reinsurance receivables	2,818.0
Transaction expenses and other	(14.6)
Release of future loss reserve	189.3
Subtotal	(1,067.6)
Net realized gains on the transfer of assets related to reinsurance transaction		$ 363.4	$ 0.0	363.4	0.0
Pre-tax loss related to reinsurance transaction	$ (704.2)
Stock options, restricted stock and performance units				$ 19.6	$ 17.8