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3. Fair Value and Gross Unrealized Losses with Unrealized Losses (Details) - USD ($) $ in Millions	Sep. 30, 2020	Dec. 31, 2019
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	$ 0.1	$ 0.4
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	0.0	0.1
Debt Securities, Available-for-sale, Unrealized Loss Position	6.9	111.8
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	6.9	91.9
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	0.0	19.9
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	0.1	0.3
Corporate Debt Securities [Member]
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax		0.1
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss		0.0
Debt Securities, Available-for-sale, Unrealized Loss Position		48.6
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months		46.5
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer		2.1
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss		0.1
US Government Sponsored Agencies [Member]
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax		0.2
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss		0.0
Debt Securities, Available-for-sale, Unrealized Loss Position		38.3
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months		27.5
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer		10.8
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss		0.2
Asset-backed Securities [Member]
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	0.1	0.1
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	0.0	0.1
Debt Securities, Available-for-sale, Unrealized Loss Position	6.9	24.9
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	6.9	17.9
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	0.0	7.0
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	0.1	$ 0.0
Fair Value, Recurring [Member] | Debt Securities [Member]
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	$ 0.1

X

- Definition

Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale that have been in a continuous loss position for less than twelve months.

+ References

No definition available.

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- Definition

Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for more than 12 months, without allowance for credit loss. Includes beneficial interest in securitized financial asset.

+ References

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Amount of accumulated unrealized loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for 12 months or longer, without allowance for credit loss. Includes beneficial interest in securitized financial asset.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
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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 continuous unrealized loss position for less than 12 months, without allowance for credit loss. Includes beneficial interest in securitized financial asset.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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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.

+ References

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Amount of accumulated unrealized loss on 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. Includes beneficial interest in securitized financial asset.

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