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Retirement Benefits (Schedule of Components in Consolidated Balance Sheets) (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Amounts recognized in the consolidated balance sheet consisted of:
Accrued retirement benefits	$ (4,094.5)	$ (3,698.2)
Defined Benefit Pension Plans
Amounts recognized in the consolidated balance sheet consisted of:
Other noncurrent assets	299.6	163.3
Other current liabilities	(67.9)	(65.3)
Accrued retirement benefits	(3,878.2)	(3,491.0)
Accumulated other comprehensive (income) loss before income taxes	6,530.9	6,195.0
Net amount recognized	2,884.4	2,802.0
Retiree Health Benefit Plans
Amounts recognized in the consolidated balance sheet consisted of:
Other noncurrent assets	1,697.0	1,381.3
Other current liabilities	(7.4)	(7.3)
Accrued retirement benefits	(216.3)	(207.2)
Accumulated other comprehensive (income) loss before income taxes	(526.7)	(348.0)
Net amount recognized	$ 946.6	$ 818.8

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