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3. Fair Value Measurements Short-term Investments (Details) - USD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017
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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 |

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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 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 + Details
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- 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 + Details
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