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Retirement Benefits (Details 10) - Pension Benefits [Member] - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Defined Benefit Plan Disclosure [Line Items]
Projected benefit obligation	$ 2,611.8	$ 2,538.9
Accumulated benefit obligation	2,595.6	2,526.1
Fair value of plan assets	$ 1,932.8	$ 1,802.4

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Amount of accumulated benefit obligation for defined benefit plan with accumulated benefit obligation in excess of plan assets.

+ References

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