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2. Fair Value Measurements Fair Value Level Table (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2022 | Jun. 30, 2022 | Dec. 31, 2021
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Unrealized Gain on Securities |  | $ (1,280.0) |  |  |
Debt Securities, Trading, and Equity Securities, FV-NI | [1] | 286.7 | $ 286.7 | $ 443.1 |
Debt Securities, Available-for-sale | [2] | 1,315.8 | 1,315.8 |  |
Fair Value, Option, Changes in Fair Value, Gain (Loss) | [1] |  | (129.6) |  |
Foreign exchange (gains) losses, net | [1] |  | (26.8) |  |
Fair Value, Option, Loans Held as Assets [Abstract] |  |  |  |  |
Investment Owned, Unrecognized Unrealized Appreciation (Depreciation), Net | [1] | (85.9) | (85.9) |  |
Debt Securities | [1] |  |  | $ 400.0 |
Asset at Fair Value, Changes in Fair Value Resulting from Changes in Assumptions | [1] |  | (43.7) |  |
Derivative, Forward Interest Rate |  |  |  | 1.50% |
Fair Value, Recurring [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Restricted Investments, at Fair Value | [3] | 6.9 | 6.9 | $ 6.9 |
Equity Securities | [4] | 7,815.4 | 7,815.4 | 13,977.5 |
Debt Securities, Trading, and Equity Securities, FV-NI | [1] | 286.7 | 286.7 | 443.1 |
Debt Securities, Available-for-sale | [2] | 1,315.8 | 1,315.8 | 327.7 |
Forward Foreign Exchange Contracts, Asset, Fair Value Disclosure | [5] | 3.7 | 3.7 | 1.7 |
Assets, Fair Value Disclosure |  | 9,634.6 | 9,634.6 | 14,899.5 |
Forward Foreign Exchange Contracts, Liability, Fair Value Disclosure | [6] | 1.2 | 1.2 | 2.8 |
Liabilities, Fair Value Disclosure |  | 1.2 | 1.2 | 2.8 |
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Restricted Investments, at Fair Value | [3] | 6.9 | 6.9 | 6.9 |
Equity Securities | [4] | 7,815.4 | 7,815.4 | 13,977.5 |
Debt Securities, Trading, and Equity Securities, FV-NI | [1] | 0.0 | 0.0 | 0.0 |
Debt Securities, Available-for-sale | [2] | 0.0 | 0.0 | 0.0 |
Forward Foreign Exchange Contracts, Asset, Fair Value Disclosure | [5] | 0.0 | 0.0 | 0.0 |
Assets, Fair Value Disclosure |  | 7,958.1 | 7,958.1 | 14,042.3 |
Forward Foreign Exchange Contracts, Liability, Fair Value Disclosure | [6] | 0.0 | 0.0 | 0.0 |
Liabilities, Fair Value Disclosure |  | 0.0 | 0.0 | 0.0 |
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Restricted Investments, at Fair Value | [3] | 0.0 | 0.0 | 0.0 |
Equity Securities | [4] | 0.0 | 0.0 | 0.0 |
Debt Securities, Trading, and Equity Securities, FV-NI | [1] | 0.0 | 0.0 | 0.0 |
Debt Securities, Available-for-sale |  | 1,315.8 | 1,315.8 | 327.7 | [2]
Forward Foreign Exchange Contracts, Asset, Fair Value Disclosure | [5] | 3.7 | 3.7 | 1.7 |
Assets, Fair Value Disclosure |  | 1,389.8 | 1,389.8 | 414.1 |
Forward Foreign Exchange Contracts, Liability, Fair Value Disclosure | [6] | 1.2 | 1.2 | 2.8 |
Liabilities, Fair Value Disclosure |  | 1.2 | 1.2 | 2.8 |
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Restricted Investments, at Fair Value | [3] | 0.0 | 0.0 | 0.0 |
Equity Securities | [4] | 0.0 | 0.0 | 0.0 |
Debt Securities, Trading, and Equity Securities, FV-NI | [1] | 286.7 | 286.7 | 443.1 |
Debt Securities, Available-for-sale | [2] | 0.0 | 0.0 | 0.0 |
Forward Foreign Exchange Contracts, Asset, Fair Value Disclosure | [5] | 0.0 | 0.0 | 0.0 |
Assets, Fair Value Disclosure |  | 286.7 | 286.7 | 443.1 |
Forward Foreign Exchange Contracts, Liability, Fair Value Disclosure | [6] | 0.0 | 0.0 | 0.0 |
Liabilities, Fair Value Disclosure |  | 0.0 | 0.0 | 0.0 |
US Government Sponsored Agencies [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Cash and Cash Equivalents, Fair Value Disclosure | [7] | 0.0 | 0.0 |  |
Asset-backed Securities [Member] | Fair Value, Recurring [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Cash and Cash Equivalents, Fair Value Disclosure | [7] | 4.5 | 4.5 | 0.1 |
Asset-backed Securities [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Cash and Cash Equivalents, Fair Value Disclosure | [7] | 0.0 | 0.0 | 0.0 |
Asset-backed Securities [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Cash and Cash Equivalents, Fair Value Disclosure | [7] | 4.5 | 4.5 | 0.1 |
Asset-backed Securities [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Cash and Cash Equivalents, Fair Value Disclosure | [7] | 0.0 | 0.0 | 0.0 |
Commercial Paper [Member] | Fair Value, Recurring [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Cash and Cash Equivalents, Fair Value Disclosure | [7] | 56.8 | 56.8 | 39.8 |
Commercial Paper [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Cash and Cash Equivalents, Fair Value Disclosure | [7] | 0.0 | 0.0 | 0.0 |
Commercial Paper [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Cash and Cash Equivalents, Fair Value Disclosure | [7] | 56.8 | 56.8 | 39.8 |
Commercial Paper [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Cash and Cash Equivalents, Fair Value Disclosure | [7] | 0.0 | 0.0 | 0.0 |
Time Deposits [Member] | Fair Value, Recurring [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Cash and Cash Equivalents, Fair Value Disclosure | [7] | 36.3 | 36.3 | 17.3 |
Time Deposits [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Cash and Cash Equivalents, Fair Value Disclosure | [7] | 36.3 | 36.3 | 7.2 |
Time Deposits [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Cash and Cash Equivalents, Fair Value Disclosure | [7] | 0.0 | 0.0 | 10.1 |
Time Deposits [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Cash and Cash Equivalents, Fair Value Disclosure | [7] | 0.0 | 0.0 | 0.0 |
Money Market Funds [Member] | Fair Value, Recurring [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Cash and Cash Equivalents, Fair Value Disclosure | [7] | 99.5 | 99.5 | 50.7 |
Money Market Funds [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Cash and Cash Equivalents, Fair Value Disclosure | [7] | 99.5 | 99.5 | 50.7 |
Money Market Funds [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Cash and Cash Equivalents, Fair Value Disclosure | [7] | 0.0 | 0.0 | 0.0 |
Money Market Funds [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Cash and Cash Equivalents, Fair Value Disclosure | [7] | 0.0 | 0.0 | 0.0 |
Cash Equivalents [Member] | Fair Value, Recurring [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Cash and Cash Equivalents, Fair Value Disclosure | [7] | 206.1 | 206.1 | 142.6 |
Cash Equivalents [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Cash and Cash Equivalents, Fair Value Disclosure | [7] | 135.8 | 135.8 | 57.9 |
Cash Equivalents [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Cash and Cash Equivalents, Fair Value Disclosure | [7] | 70.3 | 70.3 | 84.7 |
Cash Equivalents [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Cash and Cash Equivalents, Fair Value Disclosure | [7] | 0.0 | 0.0 | 0.0 |
US Treasury Securities |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Cash and Cash Equivalents, Fair Value Disclosure | [7] | 9.0 | 9.0 |  |
US Treasury Securities | Fair Value, Recurring [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Cash and Cash Equivalents, Fair Value Disclosure | [7] |  |  | 33.6 |
US Treasury Securities | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Cash and Cash Equivalents, Fair Value Disclosure | [7] | 9.0 | 9.0 | 33.6 |
US Treasury Securities | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Cash and Cash Equivalents, Fair Value Disclosure | [7] | 0.0 | 0.0 | 0.0 |
Foreign Government Debt [Member] | Fair Value, Recurring [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Cash and Cash Equivalents, Fair Value Disclosure | [7] |  |  | 0.8 |
Foreign Government Debt [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Cash and Cash Equivalents, Fair Value Disclosure | [7] |  |  | 0.0 |
Foreign Government Debt [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Cash and Cash Equivalents, Fair Value Disclosure | [7] |  |  | 0.8 |
Foreign Government Debt [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Cash and Cash Equivalents, Fair Value Disclosure | [7] |  |  | 0.0 |
Municipal Notes | Fair Value, Recurring [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Cash and Cash Equivalents, Fair Value Disclosure | [7] |  |  | 0.3 |
Municipal Notes | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Cash and Cash Equivalents, Fair Value Disclosure | [7] |  |  | 0.0 |
Municipal Notes | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Cash and Cash Equivalents, Fair Value Disclosure | [7] |  |  | 0.3 |
Municipal Notes | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Cash and Cash Equivalents, Fair Value Disclosure | [7] |  |  | 0.0 |
Foreign Government Debt [Member] | Fair Value, Recurring [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Debt Securities, Available-for-sale | [2] |  |  | 3.8 |
Foreign Government Debt [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Debt Securities, Available-for-sale | [2] |  |  | 0.0 |
Foreign Government Debt [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Debt Securities, Available-for-sale | [2] |  |  | 3.8 |
Foreign Government Debt [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Debt Securities, Available-for-sale | [2] |  |  | 0.0 |
Municipal Obligations (Member) | Fair Value, Recurring [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Debt Securities, Available-for-sale | [2] | 27.4 | 27.4 | 9.0 |
Municipal Obligations (Member) | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Debt Securities, Available-for-sale | [2] | 0.0 | 0.0 | 0.0 |
Municipal Obligations (Member) | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Debt Securities, Available-for-sale | [2] | 27.4 | 27.4 | 9.0 |
Municipal Obligations (Member) | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Debt Securities, Available-for-sale | [2] | 0.0 | 0.0 | 0.0 |
Foreign Government Obligations [Member] | Fair Value, Recurring [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Debt Securities, Available-for-sale | [2] | 10.1 | 10.1 | 1.0 |
Foreign Government Obligations [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Debt Securities, Available-for-sale | [2] | 0.0 | 0.0 | 0.0 |
Foreign Government Obligations [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Debt Securities, Available-for-sale | [2] | 10.1 | 10.1 | 1.0 |
Foreign Government Obligations [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Debt Securities, Available-for-sale | [2] | 0.0 | 0.0 | 0.0 |
Corporate Debt Securities [Member] | Fair Value, Recurring [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Debt Securities, Available-for-sale | [2] | 692.2 | 692.2 | 182.3 |
Corporate Debt Securities [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Debt Securities, Available-for-sale | [2] | 0.0 | 0.0 | 0.0 |
Corporate Debt Securities [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Debt Securities, Available-for-sale | [2] | 692.2 | 692.2 | 182.3 |
Corporate Debt Securities [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Debt Securities, Available-for-sale | [2] | 0.0 | 0.0 | 0.0 |
US Government Sponsored Agencies [Member] | Fair Value, Recurring [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Debt Securities, Available-for-sale | [2] | 227.4 | 227.4 | 44.3 |
US Government Sponsored Agencies [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Debt Securities, Available-for-sale | [2] | 0.0 | 0.0 | 0.0 |
US Government Sponsored Agencies [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Debt Securities, Available-for-sale | [2] | 227.4 | 227.4 | 44.3 |
US Government Sponsored Agencies [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Debt Securities, Available-for-sale | [2] | 0.0 | 0.0 | 0.0 |
Asset-backed Securities [Member] | Fair Value, Recurring [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Debt Securities, Available-for-sale | [2] | 358.7 | 358.7 | 87.3 |
Asset-backed Securities [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Debt Securities, Available-for-sale | [2] | 0.0 | 0.0 | 0.0 |
Asset-backed Securities [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Debt Securities, Available-for-sale | [2] | 358.7 | 358.7 | 87.3 |
Asset-backed Securities [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Debt Securities, Available-for-sale | [2] | 0.0 | 0.0 | 0.0 |
Short-term Investments [Member] | Fair Value, Recurring [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Equity Securities | [4] | 55.2 | 55.2 | 71.4 |
Debt Securities, Available-for-sale | [2] | 1,315.8 | 1,315.8 | 327.7 |
Short-term Investments [Member] | Foreign Government Debt [Member] | Fair Value, Recurring [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Debt Securities, Available-for-sale | [2] |  |  | 3.8 |
Short-term Investments [Member] | Municipal Obligations (Member) | Fair Value, Recurring [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Debt Securities, Available-for-sale | [2] | 27.4 | 27.4 | 9.0 |
Short-term Investments [Member] | Foreign Government Obligations [Member] | Fair Value, Recurring [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Debt Securities, Available-for-sale | [2] | 10.1 | 10.1 | 1.0 |
Short-term Investments [Member] | Corporate Debt Securities [Member] | Fair Value, Recurring [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Debt Securities, Available-for-sale | [2] | 692.2 | 692.2 | 182.2 |
Short-term Investments [Member] | US Government Sponsored Agencies [Member] | Fair Value, Recurring [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Debt Securities, Available-for-sale | [2] | 227.4 | 227.4 | 44.3 |
Short-term Investments [Member] | Asset-backed Securities [Member] | Fair Value, Recurring [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Debt Securities, Available-for-sale | [2] | 358.7 | 358.7 | 87.4 |
Other Investments [Member] | Fair Value, Recurring [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Restricted Investments, at Fair Value | [3] | 1.3 | 1.3 | 1.3 |
Equity Securities | [4] | 7,760.2 | 7,760.2 | 13,906.1 |
Restricted investment [Member] | Fair Value, Recurring [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Restricted Investments, at Fair Value | [3] | $ 5.6 | $ 5.6 | $ 5.6 |
[1] | The Loan under the fair value option is included in Other investments in the condensed consolidated balance sheets.
[2] | Available-for-sale investments are included in Short-term investments in the condensed consolidated balance sheets.
[3] | Restricted investments are included in the following accounts in the condensed consolidated balance sheets (in millions):
| June 30, 2022 |  | December 31, 2021
Restricted investments | $ | 5.6 |  |  | $ | 5.6 |
Other investments | 1.3 |  |  | 1.3 |
Total | $ | 6.9 |  |  | $ | 6.9 |
[4] | Equity securities are included in the following accounts in the condensed consolidated balance sheets (in millions):
| June 30, 2022 |  | December 31, 2021
Short-term investments | $ | 55.2 |  |  | $ | 71.4 |
Other investments | 7,760.2 |  |  | 13,906.1 |
Total | $ | 7,815.4 |  |  | $ | 13,977.5 |
[5] | Forward foreign exchange contracts in an asset position are included in Other current assets in the condensed consolidated balance sheets.
[6] | Forward foreign exchange contracts in a liability position are included in Other current liabilities in the condensed consolidated balance sheets.
[7] | Cash equivalents are included in Cash and cash equivalents in the condensed consolidated balance sheets.

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