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2. Available-for-Sale Investments (Details) - USD ($)
$ in Millions

Mar. 31, 2021

Dec. 31, 2020

Debt Securities, Available-for-sale [Line Items]

Amortized Cost

$ 278.8

Debt Securities, Available-for-sale

282.3

Fair Value, Recurring [Member]

Debt Securities, Available-for-sale [Line Items]

Amortized Cost

278.8

$ 262.2

Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax

3.6

5.4

Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax

(0.1)

0.0

Debt Securities, Available-for-sale, Allowance for Credit Loss

0.0

0.0

Debt Securities, Available-for-sale

^[1]

282.3

267.6

Fair Value, Recurring [Member] | Corporate Debt Securities [Member]

Debt Securities, Available-for-sale [Line Items]

Debt Securities, Available-for-sale

^[1]

162.2

133.2

Fair Value, Recurring [Member] | Municipal obligations [Member]

Debt Securities, Available-for-sale [Line Items]

Debt Securities, Available-for-sale

^[1]

14.1

15.2

Fair Value, Recurring [Member] | US Government Sponsored Agencies [Member]

Debt Securities, Available-for-sale [Line Items]

Debt Securities, Available-for-sale

^[1]

71.8

76.9

Fair Value, Recurring [Member] | Foreign Government Obligations [Member]

Debt Securities, Available-for-sale [Line Items]

Debt Securities, Available-for-sale

^[1]

4.0

4.0

Fair Value, Recurring [Member] | Foreign Government Debt [Member]

Debt Securities, Available-for-sale [Line Items]

Debt Securities, Available-for-sale

2.1

^[1]

2.1

Fair Value, Recurring [Member] | Asset-backed Securities [Member]

Debt Securities, Available-for-sale [Line Items]

Debt Securities, Available-for-sale

^[1]

28.1

36.2

Fair Value, Recurring [Member] | Other Long-term Investments [Member]

Debt Securities, Available-for-sale [Line Items]

Amortized Cost

0.1

0.1

Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax

0.0

0.0

Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax

0.0

0.0

Debt Securities, Available-for-sale, Allowance for Credit Loss

0.0

0.0

Debt Securities, Available-for-sale

0.1

0.1

Fair Value, Recurring [Member] | Other Long-term Investments [Member] | Asset-backed Securities [Member]

Debt Securities, Available-for-sale [Line Items]

Amortized Cost

0.1

0.1

Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax

0.0

0.0

Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax

0.0

0.0

Debt Securities, Available-for-sale, Allowance for Credit Loss

0.0

0.0

Debt Securities, Available-for-sale

0.1

0.1

Fair Value, Recurring [Member] | Short-term Investments [Member]

Debt Securities, Available-for-sale [Line Items]

Amortized Cost

278.7

262.1

Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax

3.6

5.4

Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax

(0.1)

0.0

Debt Securities, Available-for-sale, Allowance for Credit Loss

0.0

0.0

Debt Securities, Available-for-sale

^[1]

282.2

267.5

Fair Value, Recurring [Member] | Short-term Investments [Member] | Corporate Debt Securities [Member]

Debt Securities, Available-for-sale [Line Items]

Amortized Cost

160.3

130.5

Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax

1.9

2.7

Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax

0.0

0.0

Debt Securities, Available-for-sale, Allowance for Credit Loss

0.0

0.0

Debt Securities, Available-for-sale

162.2

133.2

Fair Value, Recurring [Member] | Short-term Investments [Member] | Municipal obligations [Member]

Debt Securities, Available-for-sale [Line Items]

Amortized Cost

14.0

15.0

Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax

0.1

0.2

Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax

0.0

0.0

Debt Securities, Available-for-sale, Allowance for Credit Loss

0.0

0.0

Debt Securities, Available-for-sale

14.1

15.2

Fair Value, Recurring [Member] | Short-term Investments [Member] | US Government Sponsored Agencies [Member]

Debt Securities, Available-for-sale [Line Items]

Amortized Cost

70.6

74.7

Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax

1.3

2.2

Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax

(0.1)

0.0

Debt Securities, Available-for-sale, Allowance for Credit Loss

0.0

0.0

Debt Securities, Available-for-sale

71.8

76.9

Fair Value, Recurring [Member] | Short-term Investments [Member] | Foreign Government Obligations [Member]

Debt Securities, Available-for-sale [Line Items]

Amortized Cost

4.0

4.0

Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax

0.0

0.0

Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax

0.0

0.0

Debt Securities, Available-for-sale, Allowance for Credit Loss

0.0

0.0

Debt Securities, Available-for-sale

4.0

4.0

Fair Value, Recurring [Member] | Short-term Investments [Member] | Foreign Government Debt [Member]

Debt Securities, Available-for-sale [Line Items]

Amortized Cost

2.1

2.1

Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax

0.0

0.0

Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax

0.0

0.0

Debt Securities, Available-for-sale, Allowance for Credit Loss

0.0

0.0

Debt Securities, Available-for-sale

2.1

2.1

Fair Value, Recurring [Member] | Short-term Investments [Member] | Asset-backed Securities [Member]

Debt Securities, Available-for-sale [Line Items]

Amortized Cost

27.7

35.8

Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax

0.3

0.3

Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax

0.0

0.0

Debt Securities, Available-for-sale, Allowance for Credit Loss

0.0

0.0

Debt Securities, Available-for-sale

28.0

36.1

Fair Value, Recurring [Member] | Other Investments [Member]

Debt Securities, Available-for-sale [Line Items]

Debt Securities, Available-for-sale

^[1]

$ 0.1

$ 0.1

[1]

Available-for-sale investments are included in the following accounts in the condensed consolidated balance sheets (in millions):

			March 31, 2021						December 31, 2020
Short-term investments			$	282.2					$	267.5
Other investments			0.1						0.1
Total			$	282.3					$	267.6

X

- 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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- Definition

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Amount of allowance for credit loss 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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+ References

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