Schedule of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Accumulated Other Comprehensive Income (Loss)
Balance at Beginning of Year	$ (580.1)	$ (24.9)	$ 354.1	$ 374.2
Other Comprehensive Income (Loss) Before Reclassifications	(1,187.4)	253.9	(2,123.9)	(193.3)
Amounts Reclassified from Accumulated Other Comprehensive Income or Loss	4.7	6.9	2.4	(41.2)
Net Other Comprehensive Income (Loss)	(1,192.1)	247.0	(2,126.3)	(152.1)
Balance at End of Period	(1,772.2)	222.1	(1,772.2)	222.1
Net Unrealized Gain (Loss) on Securities
Accumulated Other Comprehensive Income (Loss)
Balance at Beginning of Year	66.1	678.2	962.2	1,067.7
Other Comprehensive Income (Loss) Before Reclassifications	(1,133.8)	231.4	(2,039.9)	(215.8)
Amounts Reclassified from Accumulated Other Comprehensive Income or Loss	(2.8)	(1.8)	(12.8)	(59.5)
Net Other Comprehensive Income (Loss)	(1,131.0)	233.2	(2,027.1)	(156.3)
Balance at End of Period	(1,064.9)	911.4	(1,064.9)	911.4
Net Gain on Hedges
Accumulated Other Comprehensive Income (Loss)
Balance at Beginning of Year	51.4	77.1	61.8	97.8
Other Comprehensive Income (Loss) Before Reclassifications	5.5	13.7	5.9	6.9
Amounts Reclassified from Accumulated Other Comprehensive Income or Loss	10.5	13.3	21.3	27.2
Net Other Comprehensive Income (Loss)	(5.0)	0.4	(15.4)	(20.3)
Balance at End of Period	46.4	77.5	46.4	77.5
Foreign Currency Translation Adjustment
Accumulated Other Comprehensive Income (Loss)
Balance at Beginning of Year	(305.8)	(254.0)	(273.9)	(261.3)
Other Comprehensive Income (Loss) Before Reclassifications	(61.1)	9.3	(93.0)	16.6
Amounts Reclassified from Accumulated Other Comprehensive Income or Loss	0.0	0.0	0.0	0.0
Net Other Comprehensive Income (Loss)	(61.1)	9.3	(93.0)	16.6
Balance at End of Period	(366.9)	(244.7)	(366.9)	(244.7)
Unrecognized Pension and Postretirement Benefit Costs
Accumulated Other Comprehensive Income (Loss)
Balance at Beginning of Year	(391.8)	(526.2)	(396.0)	(530.0)
Other Comprehensive Income (Loss) Before Reclassifications	2.0	(0.5)	3.1	(1.0)
Amounts Reclassified from Accumulated Other Comprehensive Income or Loss	(3.0)	(4.6)	(6.1)	(8.9)
Net Other Comprehensive Income (Loss)	5.0	4.1	9.2	7.9
Balance at End of Period	$ (386.8)	$ (522.1)	$ (386.8)	$ (522.1)