Fair Value Measurement - Level III Financial Assets Measured at Fair Value (Details) - Level III - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2022	Mar. 31, 2021
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance, beginning of period	$ 6,955.3	$ 6,627.7
Purchases	1,177.1	935.4
Sales and distributions	(940.8)	(902.2)
Settlements	(163.1)	(241.9)
Realized and unrealized gains (losses), net
Included in earnings	(78.5)	97.9
Included in other comprehensive income	(124.6)	(172.7)
Balance, end of period	6,825.4	6,344.2
Changes in unrealized gains (losses) included in earnings related to financial assets still held at the reporting date	(84.8)	88.1
Changes in unrealized gains (losses) included in other comprehensive income related to financial assets still held at the reporting date	(102.6)	(147.9)
Equity securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance, beginning of period	17.9	9.4
Purchases	0.1	0.1
Sales and distributions	(6.8)	(0.6)
Settlements	0.0	0.0
Realized and unrealized gains (losses), net
Included in earnings	0.4	0.9
Included in other comprehensive income	(0.3)	(0.3)
Balance, end of period	11.3	9.5
Changes in unrealized gains (losses) included in earnings related to financial assets still held at the reporting date	0.3	0.7
Changes in unrealized gains (losses) included in other comprehensive income related to financial assets still held at the reporting date	(0.2)	(0.3)
Bonds
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance, beginning of period	599.5	550.4
Purchases	182.5	151.0
Sales and distributions	(186.9)	(155.4)
Settlements	(0.3)	(3.6)
Realized and unrealized gains (losses), net
Included in earnings	(13.8)	4.4
Included in other comprehensive income	(15.8)	(21.6)
Balance, end of period	565.2	525.2
Changes in unrealized gains (losses) included in earnings related to financial assets still held at the reporting date	(14.5)	3.2
Changes in unrealized gains (losses) included in other comprehensive income related to financial assets still held at the reporting date	(10.8)	(16.6)
Loans
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance, beginning of period	5,898.1	5,497.1
Purchases	766.0	755.3
Sales and distributions	(731.0)	(676.2)
Settlements	(162.8)	(238.3)
Realized and unrealized gains (losses), net
Included in earnings	(53.9)	87.2
Included in other comprehensive income	(103.9)	(154.1)
Balance, end of period	5,612.5	5,271.0
Changes in unrealized gains (losses) included in earnings related to financial assets still held at the reporting date	(59.4)	79.1
Changes in unrealized gains (losses) included in other comprehensive income related to financial assets still held at the reporting date	(87.0)	(134.3)
Investments in CLOs
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance, beginning of period	361.1	489.4
Purchases	227.6	29.0
Sales and distributions	(14.1)	(54.8)
Settlements	0.0	0.0
Realized and unrealized gains (losses), net
Included in earnings	(9.6)	(4.0)
Included in other comprehensive income	(4.6)	3.3
Balance, end of period	560.4	462.9
Changes in unrealized gains (losses) included in earnings related to financial assets still held at the reporting date	(9.6)	(4.0)
Changes in unrealized gains (losses) included in other comprehensive income related to financial assets still held at the reporting date	(4.6)	3.3
Other investments
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance, beginning of period	78.7	81.4
Purchases	0.9	0.0
Sales and distributions	(2.0)	(15.2)
Settlements	0.0	0.0
Realized and unrealized gains (losses), net
Included in earnings	(1.6)	9.4
Included in other comprehensive income	0.0	0.0
Balance, end of period	76.0	75.6
Changes in unrealized gains (losses) included in earnings related to financial assets still held at the reporting date	(1.6)	9.1
Changes in unrealized gains (losses) included in other comprehensive income related to financial assets still held at the reporting date	$ 0.0	$ 0.0

Amount of unrealized gain (loss) recognized in other comprehensive income (OCI) from asset measured at fair value on recurring basis using unobservable input (level 3) and still held.

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Amount of unrealized gain (loss) recognized in income from asset measured at fair value on recurring basis using unobservable input (level 3) and still held.

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Amount of gain (loss) recognized in income from asset measured at fair value on recurring basis using unobservable input (level 3).

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-Name Accounting Standards Codification
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Amount of gain (loss) recognized in other comprehensive income (OCI) from asset measured at fair value on recurring basis using unobservable input (level 3).

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Amount of purchases of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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Amount of sale of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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Amount of settlement of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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Fair value of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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