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Retirement Benefits (Details1) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Pension Plans Defined Benefit |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Service cost - benefits earned during the year | $ 3.2 | $ 3.2 | $ 9.5 | $ 9.5
Interest cost on benefits earned in prior years | 21.6 | 26.4 | 64.7 | 79.1
Expected return on plan assets | (33.6) | (32.8) | (100.8) | (98.5)
Amortization of prior service cost (credit) | 0.1 | 0.0 | 0.5 | 0.2
Amortization of net actuarial loss | 18.6 | 18.5 | 55.8 | 55.3
Total retirement benefit expense | 9.9 | 15.3 | 29.7 | 45.6
Other Postretirement Benefit Plan, Defined Benefit |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Service cost - benefits earned during the year | 0.6 | 0.5 | 1.7 | 1.4
Interest cost on benefits earned in prior years | 2.6 | 3.7 | 8.0 | 11.1
Expected return on plan assets | 0.0 | 0.0 | 0.0 | 0.0
Amortization of prior service cost (credit) | (0.9) | (0.7) | (2.8) | (2.1)
Amortization of net actuarial loss | 2.7 | 3.4 | 8.1 | 10.1
Total retirement benefit expense | $ 5.0 | $ 6.9 | $ 15.0 | $ 20.5

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