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Retirement Benefits (Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Defined Benefit Plan Disclosure [Line Items]
Defined benefit obligation, period decrease	$ 4,750.0	$ 750.4
Expense under the plans	$ 170.6	167.3	$ 164.3
Percentage of global investments in plan assets	85.00%
Defined Benefit Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Total accumulated benefit obligation for our defined benefit pension plans	$ 12,010.0	$ 16,440.0
Expected future employer contributions, next fiscal year	$ 30.0
Marketable equity securities
Defined Benefit Plan Disclosure [Line Items]
Plan assets, target allocation	75.00%
Developed markets
Defined Benefit Plan Disclosure [Line Items]
Plan assets, target allocation	25.00%

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Percentage description of US defined benefit and other postretirement plan assets as compared to the total global investment balance

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Amount of actuarial present value of benefits attributed to employee service rendered, excluding assumptions about future compensation level.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
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-Section 50
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