CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Statement of Comprehensive Income [Abstract]
Net Income	$ 410.7	$ 328.6	$ 1,034.6	$ 664.5
Other Comprehensive Income (Loss)
Change in Net Unrealized Gain (Loss) on Securities Before Adjustment (net of tax benefit of $(520.8); $(69.0); $(2,017.2); $(276.3))	(1,925.8)	(260.8)	(7,500.7)	(1,048.0)
Change in Adjustment to Deferred Acquisition Costs and Reserves for Future Policy and Contract Benefits, Net of Reinsurance (net of tax expense of $184.3; $49.5; $1,141.7; $215.5)	661.4	185.4	4,209.2	816.3
Change in Net Gain on Hedges (net of tax benefit of $8.1; $2.2; $12.6; $7.6)	(32.9)	(8.0)	(48.3)	(28.3)
Change in Foreign Currency Translation Adjustment (net of tax expense of $5.4; $1.8; $11.5; $3.4)	(71.1)	(30.5)	(164.1)	(13.9)
Change in Unrecognized Pension and Postretirement Benefit Costs (net of tax expense of $1.1; $1.8; $4.0; $4.2)	(5.9)	(5.7)	(15.1)	(13.6)
Net Other Comprehensive Income (Loss)	(1,362.5)	(108.2)	(3,488.8)	(260.3)
Comprehensive Income (Loss)	$ (951.8)	$ 220.4	$ (2,454.2)	$ 404.2