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Fair Value Measurements - Financial Instruments Not Reported at Fair Value (Details) - USD ($) $ in Millions	Mar. 31, 2021	Dec. 31, 2020
Assets (liabilities)
Mortgage loans	$ 18,177.2	$ 17,343.0
Policy loans	774.7	784.0
Short-term debt	(84.0)	(84.7)
Long-term debt	(4,279.4)	(4,279.2)
Carrying amount
Assets (liabilities)
Mortgage loans	18,177.2	17,343.0
Policy loans	774.7	784.0
Other investments	356.4	347.2
Cash and cash equivalents not required to be reported at fair value	1,239.6	1,383.4
Investment contracts	(35,534.5)	(35,449.9)
Short-term debt	(84.0)	(84.7)
Long-term debt	(4,279.4)	(4,279.2)
Separate account liabilities	(161,911.8)	(160,316.4)
Bank deposits	(410.0)	(423.5)
Cash collateral payable	(157.3)	(224.6)
Assets (liabilities) measured at fair value
Assets (liabilities)
Mortgage loans	19,079.2	18,762.6
Policy loans	939.0	1,037.7
Other investments	347.2	338.5
Cash and cash equivalents not required to be reported at fair value	1,239.6	1,383.4
Investment contracts	(36,040.6)	(36,738.7)
Short-term debt	(84.0)	(84.7)
Long-term debt	(4,685.4)	(4,949.9)
Separate account liabilities	(160,749.2)	(159,129.2)
Bank deposits	(414.5)	(429.7)
Cash collateral payable	(157.3)	(224.6)
Assets (liabilities) measured at fair value | Fair value hierarchy Level 1
Assets (liabilities)
Cash and cash equivalents not required to be reported at fair value	1,224.1	1,369.7
Cash collateral payable	(157.3)	(224.6)
Assets (liabilities) measured at fair value | Fair value hierarchy Level 2
Assets (liabilities)
Other investments	257.8	247.1
Cash and cash equivalents not required to be reported at fair value	15.5	13.7
Investment contracts	(5,509.9)	(5,276.9)
Short-term debt	(84.0)	(84.7)
Long-term debt	(4,644.8)	(4,908.7)
Bank deposits	(414.5)	(429.7)
Assets (liabilities) measured at fair value | Fair value hierarchy Level 3
Assets (liabilities)
Mortgage loans	19,079.2	18,762.6
Policy loans	939.0	1,037.7
Other investments	89.4	91.4
Investment contracts	(30,530.7)	(31,461.8)
Long-term debt	(40.6)	(41.2)
Separate account liabilities	$ (160,749.2)	$ (159,129.2)

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The aggregate of all deposit liabilities held by the entity, including foreign and domestic, interest and noninterest bearing; may include demand deposits, saving deposits, Negotiable Order of Withdrawal (NOW) and time deposits among others.

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Amount before allowance of loans made to policy and contract holders using their life insurance contracts' cash value or separate accounts as collateral. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums over and discounts from face amounts. Excludes loans and leases covered under loss sharing agreements.

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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