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Retirement Benefits (Components of Net Periodic (Benefit) Cost) (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2023 | Jun. 30, 2022 | Jun. 30, 2023 | Jun. 30, 2022
Defined Benefit Pension Plans |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Service cost | $ 74.9 | $ 88.2 | $ 145.3 | $ 177.3
Interest cost | 162.6 | 99.6 | 323.7 | 200.1
Expected return on plan assets | (264.2) | (237.0) | (527.5) | (476.5)
Amortization of prior service cost | 0.6 | 0.6 | 1.2 | 1.3
Recognized actuarial (gain) loss | 30.9 | 84.5 | 60.9 | 171.5
Net periodic cost | 4.8 | 35.9 | 3.6 | 73.7
Retiree Health Benefit Plans |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Service cost | 8.2 | 12.1 | 15.9 | 23.3
Interest cost | 15.3 | 9.6 | 30.7 | 19.0
Expected return on plan assets | (45.6) | (38.2) | (91.1) | (76.1)
Amortization of prior service cost | (13.2) | (13.7) | (26.4) | (27.4)
Recognized actuarial (gain) loss | (2.0) | 0.3 | (2.9) | 0.5
Net periodic cost | $ (37.3) | $ (29.9) | $ (73.8) | $ (60.7)

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