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Retirement Benefits (Details 9) $ in Millions | Dec. 31, 2017 USD ($)
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Defined Benefit Plan Disclosure [Line Items] |
Amortization of prior service cost (credit) | $ (2.5)
Amortization of net actuarial loss | 76.5
Amortization of accumulated other comprehensive loss | 74.0
Pension Benefits [Member] |
Defined Benefit Plan Disclosure [Line Items] |
Amortization of prior service cost (credit) | 0.4
Amortization of net actuarial loss | 65.9
Amortization of accumulated other comprehensive loss | 66.3
Other Postretirement Benefits [Member] |
Defined Benefit Plan Disclosure [Line Items] |
Amortization of prior service cost (credit) | (2.9)
Amortization of net actuarial loss | 10.6
Amortization of accumulated other comprehensive loss | $ 7.7

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