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

Mar. 31, 2019

Dec. 31, 2018

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

Amortized Cost

$ 357.8

Debt Securities, Available-for-sale

357.6

Fair Value, Measurements, Recurring [Member]

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

Amortized Cost

357.8

$ 375.5

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

0.9

0.3

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

(1.1)

(2.6)

Debt Securities, Available-for-sale

^[1]

357.6

373.2

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

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

Debt Securities, Available-for-sale

^[1]

194.2

215.0

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

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

Debt Securities, Available-for-sale

^[1]

10.9

11.0

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

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

Debt Securities, Available-for-sale

^[1]

66.8

63.3

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

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

Debt Securities, Available-for-sale

^[1]

79.9

80.3

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

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

Debt Securities, Available-for-sale

^[1]

3.0

3.6

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

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

Debt Securities, Available-for-sale

^[1]

2.8

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

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

Amortized Cost

0.1

0.2

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

0.1

0.2

Fair Value, Measurements, Recurring [Member] | Other Long-term Investments [Member] | Available-for-sale Securities [Member]

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

Amortized Cost

0.2

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

0.0

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

0.0

Debt Securities, Available-for-sale

0.2

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

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

Amortized Cost

0.1

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

0.0

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

0.0

Debt Securities, Available-for-sale

0.1

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

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

Debt Securities, Available-for-sale

357.5

373.0

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

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

Amortized Cost

194.1

216.2

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

0.5

0.1

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

(0.4)

(1.3)

Debt Securities, Available-for-sale

194.2

215.0

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

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

Amortized Cost

10.9

11.1

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

(0.1)

Debt Securities, Available-for-sale

10.9

11.0

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

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

Amortized Cost

66.8

63.5

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

0.1

0.0

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

(0.2)

(0.4)

Debt Securities, Available-for-sale

66.7

63.1

Fair Value, Measurements, Recurring [Member] | Short-term Investments [Member] | Available-for-sale Securities [Member]

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

Amortized Cost

375.3

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

0.3

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

(2.6)

Debt Securities, Available-for-sale

373.0

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

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

Amortized Cost

80.1

80.9

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

0.3

0.2

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

(0.5)

(0.8)

Debt Securities, Available-for-sale

79.9

80.3

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

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

Amortized Cost

3.0

3.6

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

3.0

3.6

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

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

Amortized Cost

2.8

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

0.0

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

0.0

Debt Securities, Available-for-sale

2.8

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

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

Amortized Cost

357.7

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

0.9

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

(1.1)

Debt Securities, Available-for-sale

357.5

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

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

Debt Securities, Available-for-sale

$ 0.1

$ 0.2

[1]

Available-for-sale investments are included in the following accounts in the Condensed Consolidated Balance Sheets (in millions):

	March 31, 2019				December 31, 2018
Short-term investments	$	357.5			$	373.0
Other investments	0.1				0.2
Total	$	357.6			$	373.2

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

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563

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X

- Definition

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).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563

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X

- Definition

Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563

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X

- Definition

Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 45
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=109979856&loc=d3e26610-111562

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (aa)
-URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563

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- Definition

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+ References

No definition available.

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