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Financial Instruments (Unrealized Gains and Losses) (Details) - USD ($) $ in Millions	Mar. 31, 2023	Dec. 31, 2022
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Unrealized gross gains	$ 1.8	$ 0.6
Unrealized gross losses	39.0	49.2
Fair value of securities in an unrealized gain position	120.5	46.8
Fair value of securities in an unrealized loss position	$ 512.4	$ 568.7

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- Definition

Debt Securities, Available-for-sale, Unrealized Gain Position

+ References

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- Definition

Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

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Amount, before tax, of unrealized loss in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in unrealized loss position without allowance for credit loss.

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