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Retirement Benefits (Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Defined Benefit Plan Disclosure [Line Items]
Defined benefit obligation, period increase (decrease)	$ (750.4)	$ 2,130.0
Expense under the plans	$ 167.3	164.3	$ 145.2
Percentage of global investments in plan assets	80.00%
Defined Benefit Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Total accumulated benefit obligation for our defined benefit pension plans	$ 16,440.0	$ 17,030.0
Expected future employer contributions, next fiscal year	$ 40.0
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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-Publisher FASB
-Name Accounting Standards Codification
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