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Fair Value Measurements (Details) - USD ($) $ in Millions | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Unrealized Gain on Securities |  | $ 29.0 |  |  |
Debt Securities, Trading, and Equity Securities, FV-NI |  | 336.5 | $ 317.5 |  |
Debt Securities, Available-for-sale | [1] | 1,063.4 |  |  |
Fair Value, Option, Changes in Fair Value, Gain (Loss) |  | 4.6 |  |  |
Foreign exchange (gains) losses, net |  | 14.4 |  |  |
Fair Value, Option, Loans Held as Assets [Abstract] |  |  |  |  |
Debt Securities | [2] |  |  |  | $ 400.0
Asset at Fair Value, Changes in Fair Value Resulting from Changes in Assumptions |  | (6.0) |  |  |
Derivative, Forward Interest Rate |  |  |  |  | 1.50%
Value Appreciation Right, Changes in Fair Value, Gain (Loss) |  | $ 1.4 |  |  |
Ordinary voting shares [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Investment ownership percentage |  | 38.00% |  |  |
Preference shares [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Investment ownership percentage |  | 28.00% |  |  |
Fair Value, Recurring |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Restricted Investments, at Fair Value | [3] | $ 1.3 | 1.6 |  |
Equity Securities | [4] | 4,677.0 | 4,548.0 |  |
Debt Securities, Trading, and Equity Securities, FV-NI | [2] | 336.5 | 317.5 |  |
Debt Securities, Available-for-sale | [1] | 1,063.4 | 1,097.6 |  |
Forward Foreign Exchange Contracts, Asset, Fair Value Disclosure | [5] | 2.1 | 8.8 |  |
Assets, Fair Value Disclosure |  | 6,297.6 | 6,159.0 |  |
Forward Foreign Exchange Contracts, Liability, Fair Value Disclosure | [6] | 0.7 | 2.4 |  |
Liabilities, Fair Value Disclosure |  | 0.7 | 2.4 |  |
Fair Value, Recurring | 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] | 1.3 | 1.6 |  |
Equity Securities | [4] | 4,677.0 | 4,548.0 |  |
Debt Securities, Trading, and Equity Securities, FV-NI | [2] | 0.0 | 0.0 |  |
Debt Securities, Available-for-sale | [1] | 0.0 | 0.0 |  |
Forward Foreign Exchange Contracts, Asset, Fair Value Disclosure | [5] | 0.0 | 0.0 |  |
Assets, Fair Value Disclosure |  | 4,850.7 | 4,689.0 |  |
Forward Foreign Exchange Contracts, Liability, Fair Value Disclosure | [6] | 0.0 | 0.0 |  |
Liabilities, Fair Value Disclosure |  | 0.0 | 0.0 |  |
Fair Value, Recurring | 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 |  |
Equity Securities | [4] | 0.0 | 0.0 |  |
Debt Securities, Trading, and Equity Securities, FV-NI | [2] | 0.0 | 0.0 |  |
Debt Securities, Available-for-sale |  | 1,063.4 | 1,097.6 | [1] |
Forward Foreign Exchange Contracts, Asset, Fair Value Disclosure | [5] | 2.1 | 8.8 |  |
Assets, Fair Value Disclosure |  | 1,110.4 | 1,152.5 |  |
Forward Foreign Exchange Contracts, Liability, Fair Value Disclosure | [6] | 0.7 | 2.4 |  |
Liabilities, Fair Value Disclosure |  | 0.7 | 2.4 |  |
Fair Value, Recurring | 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 |  |
Equity Securities | [4] | 0.0 | 0.0 |  |
Debt Securities, Trading, and Equity Securities, FV-NI | [2] | 336.5 | 317.5 |  |
Debt Securities, Available-for-sale | [1] | 0.0 | 0.0 |  |
Forward Foreign Exchange Contracts, Asset, Fair Value Disclosure | [5] | 0.0 | 0.0 |  |
Assets, Fair Value Disclosure |  | 336.5 | 317.5 |  |
Forward Foreign Exchange Contracts, Liability, Fair Value Disclosure | [6] | 0.0 | 0.0 |  |
Liabilities, Fair Value Disclosure |  | 0.0 | 0.0 |  |
US Government Sponsored Agencies [Member] | Fair Value, Recurring | 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 |  |  |
Money Market Funds [Member] | Fair Value, Recurring |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Cash and Cash Equivalents, Fair Value Disclosure | [7] | 172.4 | 139.4 |  |
Money Market Funds [Member] | Fair Value, Recurring | 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] | 172.4 | 139.4 |  |
Money Market Funds [Member] | Fair Value, Recurring | 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 |  |
Money Market Funds [Member] | Fair Value, Recurring | 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 |  |
Cash Equivalents [Member] | Fair Value, Recurring |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Cash and Cash Equivalents, Fair Value Disclosure | [7] | 217.3 | 185.5 |  |
Cash Equivalents [Member] | Fair Value, Recurring | 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] | 172.4 | 139.4 |  |
Cash Equivalents [Member] | Fair Value, Recurring | 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] | 44.9 | 46.1 |  |
Cash Equivalents [Member] | Fair Value, Recurring | 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 |  |
US Treasury Securities |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Cash and Cash Equivalents, Fair Value Disclosure | [7] | 3.0 |  |  |
US Treasury Securities | Fair Value, Recurring |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Cash and Cash Equivalents, Fair Value Disclosure | [7] |  | 14.9 |  |
US Treasury Securities | Fair Value, Recurring | 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] | 3.0 | 14.9 |  |
US Treasury Securities | Fair Value, Recurring | 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 |  |
Foreign Government Debt [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Cash and Cash Equivalents, Fair Value Disclosure | [7] | 41.9 |  |  |
Foreign Government Debt [Member] | Fair Value, Recurring |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Cash and Cash Equivalents, Fair Value Disclosure | [7] |  | 31.2 |  |
Foreign Government Debt [Member] | Fair Value, Recurring | 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 |  |
Foreign Government Debt [Member] | Fair Value, Recurring | 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] | 41.9 | 31.2 |  |
Foreign Government Debt [Member] | Fair Value, Recurring | 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 Obligations (Member) | Fair Value, Recurring |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Debt Securities, Available-for-sale | [1] | 9.0 | 9.4 |  |
Municipal Obligations (Member) | Fair Value, Recurring | Fair Value, Inputs, Level 1 [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Debt Securities, Available-for-sale | [1] | 0.0 | 0.0 |  |
Municipal Obligations (Member) | Fair Value, Recurring | Fair Value, Inputs, Level 2 [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Debt Securities, Available-for-sale | [1] | 9.0 | 9.4 |  |
Municipal Obligations (Member) | Fair Value, Recurring | Fair Value, Inputs, Level 3 [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Debt Securities, Available-for-sale | [1] | 0.0 | 0.0 |  |
Foreign Government Obligations [Member] | Fair Value, Recurring |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Debt Securities, Available-for-sale | [1] | 7.2 | 5.2 |  |
Foreign Government Obligations [Member] | Fair Value, Recurring | Fair Value, Inputs, Level 1 [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Debt Securities, Available-for-sale | [1] | 0.0 | 0.0 |  |
Foreign Government Obligations [Member] | Fair Value, Recurring | Fair Value, Inputs, Level 2 [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Debt Securities, Available-for-sale | [1] | 7.2 | 5.2 |  |
Foreign Government Obligations [Member] | Fair Value, Recurring | Fair Value, Inputs, Level 3 [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Debt Securities, Available-for-sale | [1] | 0.0 | 0.0 |  |
Corporate Debt Securities [Member] | Fair Value, Recurring |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Debt Securities, Available-for-sale | [1] | 491.5 | 533.6 |  |
Corporate Debt Securities [Member] | Fair Value, Recurring | Fair Value, Inputs, Level 1 [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Debt Securities, Available-for-sale | [1] | 0.0 | 0.0 |  |
Corporate Debt Securities [Member] | Fair Value, Recurring | Fair Value, Inputs, Level 2 [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Debt Securities, Available-for-sale | [1] | 491.5 | 533.6 |  |
Corporate Debt Securities [Member] | Fair Value, Recurring | Fair Value, Inputs, Level 3 [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Debt Securities, Available-for-sale | [1] | 0.0 | 0.0 |  |
US Government Sponsored Agencies [Member] | Fair Value, Recurring |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Debt Securities, Available-for-sale | [1] | 151.3 | 118.6 |  |
US Government Sponsored Agencies [Member] | Fair Value, Recurring | Fair Value, Inputs, Level 1 [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Debt Securities, Available-for-sale | [1] | 0.0 | 0.0 |  |
US Government Sponsored Agencies [Member] | Fair Value, Recurring | Fair Value, Inputs, Level 2 [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Debt Securities, Available-for-sale | [1] | 151.3 | 118.6 |  |
US Government Sponsored Agencies [Member] | Fair Value, Recurring | Fair Value, Inputs, Level 3 [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Debt Securities, Available-for-sale | [1] | 0.0 | 0.0 |  |
Asset-backed Securities [Member] | Fair Value, Recurring |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Debt Securities, Available-for-sale | [1] | 404.4 | 430.8 |  |
Asset-backed Securities [Member] | Fair Value, Recurring | Fair Value, Inputs, Level 1 [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Debt Securities, Available-for-sale | [1] | 0.0 | 0.0 |  |
Asset-backed Securities [Member] | Fair Value, Recurring | Fair Value, Inputs, Level 2 [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Debt Securities, Available-for-sale | [1] | 404.4 | 430.8 |  |
Asset-backed Securities [Member] | Fair Value, Recurring | Fair Value, Inputs, Level 3 [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Debt Securities, Available-for-sale | [1] | 0.0 | 0.0 |  |
Short-term Investments [Member] | Fair Value, Recurring |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Equity Securities | [4] | 75.6 | 78.8 |  |
Debt Securities, Available-for-sale | [1] | 1,063.4 | 1,097.6 |  |
Short-term Investments [Member] | Municipal Obligations (Member) | Fair Value, Recurring |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Debt Securities, Available-for-sale | [1] | 9.0 | 9.4 |  |
Short-term Investments [Member] | Foreign Government Obligations [Member] | Fair Value, Recurring |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Debt Securities, Available-for-sale | [1] | 7.2 | 5.2 |  |
Short-term Investments [Member] | Corporate Debt Securities [Member] | Fair Value, Recurring |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Debt Securities, Available-for-sale | [1] | 491.5 | 533.6 |  |
Short-term Investments [Member] | US Government Sponsored Agencies [Member] | Fair Value, Recurring |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Debt Securities, Available-for-sale | [1] | 151.3 | 118.6 |  |
Short-term Investments [Member] | Asset-backed Securities [Member] | Fair Value, Recurring |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Debt Securities, Available-for-sale | [1] | 404.4 | 430.8 |  |
Other Investments [Member] | Fair Value, Recurring |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Restricted Investments, at Fair Value | [3] | 1.3 | 1.6 |  |
Equity Securities | [4] | $ 4,601.4 | $ 4,469.2 |  |
[1] | Available-for-sale investments are included in Short-term investments in the condensed consolidated balance sheets.
[2] | The Loan under the fair value option is included in Other investments in the condensed consolidated balance sheets.
[3] | Restricted investments are included in the following account in the condensed consolidated balance sheets (in millions):
| March 31, 2025 |  | December 31, 2024
Other investments | 1.3 |  |  | 1.6 |
Total | $ | 1.3 |  |  | $ | 1.6 |
[4] | Equity securities are included in the following accounts in the condensed consolidated balance sheets (in millions):
| March 31, 2025 |  | December 31, 2024
Short-term investments | $ | 75.6 |  |  | $ | 78.8 |
Other investments | 4,601.4 |  |  | 4,469.2 |
Total | $ | 4,677.0 |  |  | $ | 4,548.0 |
[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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