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v3.25.1

Fair value measurements - Reconciliation of Investments Measured at Fair Value using Level 3 Inputs (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2025 | Mar. 31, 2024
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Beginning balance | $ 87.5 | $ 185.4
Transfers in to (out of) Level 3 | 0.0 | 0.0
Purchases | 0.0 | 0.0
Sales & Settlements | 0.0 | (4.6)
Realized and Unrealized Gains (Losses) | 27.3 | (8.8)
Ending balance | 114.8 | 172.0
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Beginning balance | (14.3) | (73.7)
Transfers in to (out of) Level 3 | 0.0 | 0.0
Purchases | 0.0 | 0.0
Sales & Settlements | 5.4 | 1.1
Realized and Unrealized Gains (Losses) | 2.8 | (29.0)
Ending balance | (6.1) | (103.8)
Liability-classified capital instruments |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Beginning balance |  | (67.3)
Transfers in to (out of) Level 3 |  | 0.0
Purchases |  | 0.0
Sales & Settlements |  | 0.0
Realized and Unrealized Gains (Losses) |  | (15.9)
Ending balance |  | (83.2)
Derivative liabilities |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Beginning balance | (14.3) | (6.4)
Transfers in to (out of) Level 3 | 0.0 | 0.0
Purchases | 0.0 | 0.0
Sales & Settlements | 5.4 | 1.1
Realized and Unrealized Gains (Losses) | 2.8 | (13.1)
Ending balance | (6.1) | (20.6)
Other long-term investments |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Beginning balance | 86.6 | 169.7
Transfers in to (out of) Level 3 | 0.0 | 0.0
Purchases | 0.0 | 0.0
Sales & Settlements | 0.0 | 0.0
Realized and Unrealized Gains (Losses) | 0.4 | 0.9
Ending balance | 87.0 | 170.6
Derivative assets |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Beginning balance | 0.9 | 15.7
Transfers in to (out of) Level 3 | 0.0 | 0.0
Purchases | 0.0 | 0.0
Sales & Settlements | 0.0 | (4.6)
Realized and Unrealized Gains (Losses) | 26.9 | (9.7)
Ending balance | $ 27.8 | $ 1.4

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- Definition Amount of gain (loss) recognized in income from asset measured at fair value on recurring basis using unobservable input (level 3). + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 101 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482078/820-10-55-101 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-3 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 102 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482078/820-10-55-102 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 + Details
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- Definition Amount of purchases of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 101 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482078/820-10-55-101 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-3 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(2) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 + Details
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- Definition Amount of gain (loss) recognized in income from liability measured at fair value on recurring basis using unobservable input (level 3). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-3 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 + Details
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