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3. Fair Value Measurements Short-term Investments (Details) - USD ($)
$ in Millions

Dec. 31, 2018

Dec. 31, 2017

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

Debt Securities, Available-for-sale, Amortized Cost

$ 375.5

Debt Securities, Available-for-sale

373.2

Fair Value, Measurements, Recurring [Member]

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

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

$ 884.8

Debt Securities, Available-for-sale, Amortized Cost

375.5

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

0.3

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

2.6

Debt Securities, Available-for-sale

373.2

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

1.5

Available-for-sale Securities

373.2

1,301.4

^[1]

Available-for-sale Securities, Amortized Cost Basis

418.1

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

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

Debt Securities, Available-for-sale

215.0

Available-for-sale Securities

^[1]

185.7

Fair Value, Measurements, Recurring [Member] | Interest-bearing Deposits [Member]

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

Available-for-sale Securities

0.7

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

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

Debt Securities, Available-for-sale

11.0

Available-for-sale Securities

^[1]

15.0

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

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

Debt Securities, Available-for-sale

63.3

Available-for-sale Securities

^[1]

55.6

Fair Value, Measurements, Recurring [Member] | Marketable Equity Securities [Member]

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

Available-for-sale Securities

^[1]

973.4

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

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

Debt Securities, Available-for-sale

80.3

Available-for-sale Securities

^[1]

67.6

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

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

Debt Securities, Available-for-sale

3.6

Available-for-sale Securities

^[1]

3.4

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

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

Available-for-sale Securities

373.0

371.2

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

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

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

0.3

Debt Securities, Available-for-sale, Amortized Cost

216.2

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

0.1

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

1.3

Debt Securities, Available-for-sale

215.0

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

0.5

Available-for-sale Securities

185.7

Available-for-sale Securities, Amortized Cost Basis

185.9

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

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

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

0.0

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

0.0

Available-for-sale Securities

0.7

Available-for-sale Securities, Amortized Cost Basis

0.7

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

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

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

0.0

Debt Securities, Available-for-sale, Amortized Cost

11.1

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

0.0

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

0.1

Debt Securities, Available-for-sale

11.0

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

0.1

Available-for-sale Securities

15.0

Available-for-sale Securities, Amortized Cost Basis

15.1

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

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

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

0.0

Debt Securities, Available-for-sale, Amortized Cost

63.5

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

0.0

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

0.4

Debt Securities, Available-for-sale

63.1

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

0.2

Available-for-sale Securities

55.4

Available-for-sale Securities, Amortized Cost Basis

55.6

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

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

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

9.0

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

0.0

Available-for-sale Securities

43.4

Available-for-sale Securities, Amortized Cost Basis

34.4

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

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

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

9.3

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

1.5

Available-for-sale Securities

371.2

Available-for-sale Securities, Amortized Cost Basis

363.4

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

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

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

0.0

Debt Securities, Available-for-sale, Amortized Cost

80.9

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

0.2

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

0.8

Debt Securities, Available-for-sale

80.3

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

0.7

Available-for-sale Securities

67.6

Available-for-sale Securities, Amortized Cost Basis

68.3

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

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

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

0.0

Debt Securities, Available-for-sale, Amortized Cost

3.6

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

0.0

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

0.0

Debt Securities, Available-for-sale

3.6

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

0.0

Available-for-sale Securities

3.4

Available-for-sale Securities, Amortized Cost Basis

3.4

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

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

Debt Securities, Available-for-sale, Amortized Cost

375.3

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

0.3

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

2.6

Debt Securities, Available-for-sale

373.0

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

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

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

0.0

Debt Securities, Available-for-sale, Amortized Cost

0.2

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

0.0

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

0.0

Debt Securities, Available-for-sale

0.2

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

0.0

Available-for-sale Securities

0.2

Available-for-sale Securities, Amortized Cost Basis

0.2

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

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

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

875.5

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

0.0

Available-for-sale Securities

930.0

Available-for-sale Securities, Amortized Cost Basis

54.5

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

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

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

875.5

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

0.0

Available-for-sale Securities

930.2

Available-for-sale Securities, Amortized Cost Basis

$ 54.7

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

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

Debt Securities, Available-for-sale, Amortized Cost

0.2

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

0.0

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

0.0

Debt Securities, Available-for-sale

$ 0.2

[1]

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

	December 31, 2018				December 31, 2017
Short-term investments	$	373.0			$	371.2
Other investments	0.2				930.2
Total	$	373.2			$	1,301.4

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).

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