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Other–Net, (Income) Expense (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Nonoperating Income (Expense) [Abstract]
Interest expense	$ 87.8	$ 92.5
Interest income	(5.5)	(14.3)
Net investment gains	(301.5)	(186.6)
Retirement benefit plans	(73.4)	(44.6)
Other (income) expense	(28.5)	63.9
Other–net, (income) expense	$ (321.1)	$ (89.1)

X

- Definition

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).

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- Definition

Amount of the cost of borrowed funds accounted for as interest expense.

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- Definition

Amount before accretion (amortization) of purchase discount (premium) of interest income on nonoperating securities.

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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.

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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).

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

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