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Retirement Benefits (Details 9) $ in Millions | Dec. 31, 2019 USD ($)
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Defined Benefit Plan Disclosure [Line Items] |
Amortization of prior service cost (credit) | $ (3.2)
Amortization of net actuarial loss | 85.3
Amortization of accumulated other comprehensive loss | 82.1
Pension Benefits [Member] |
Defined Benefit Plan Disclosure [Line Items] |
Amortization of prior service cost (credit) | 0.6
Amortization of net actuarial loss | 74.5
Amortization of accumulated other comprehensive loss | 75.1
Other Postretirement Benefits |
Defined Benefit Plan Disclosure [Line Items] |
Amortization of prior service cost (credit) | (3.8)
Amortization of net actuarial loss | 10.8
Amortization of accumulated other comprehensive loss | $ 7.0

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