Other–Net, (Income) Expense (Details) - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2025	Mar. 31, 2024
Nonoperating Income (Expense) [Abstract]
Interest expense	$ 243.7	$ 179.6
Interest income	(48.3)	(45.8)
Net investment (gains) losses on equity securities (Note 6)	146.7	(16.0)
Retirement benefit plans	(106.6)	(116.1)
Other (income) expense	3.5	(28.8)
Other–net, (income) expense	$ 239.0	$ (27.1)

Amount of unrealized and realized gain (loss) on investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI).

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 944
-SubTopic 220
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Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
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Amount of interest expense classified as nonoperating.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 22
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Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
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Amount before accretion (amortization) of purchase discount (premium) of interest income on nonoperating securities.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
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-Publisher FASB
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-Topic 280
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Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 220
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Amount of expense (reversal of expense) for net periodic benefit cost components, excluding service cost component, of defined benefit plan. Amount includes, but is not limited to, interest cost, expected (return) loss on plan asset, amortization of prior service cost (credit), amortization of (gain) loss, amortization of transition (asset) obligation, settlement (gain) loss, curtailment (gain) loss and certain termination benefits.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
-Section 45
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-Subparagraph (b)
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The aggregate amount of income or expense from ancillary business-related activities (that is to say, excluding major activities considered part of the normal operations of the business).

+ References

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No definition available.

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Amount of income (expense) related to nonoperating activities, classified as other.

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