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Retirement Benefit Plans (Breakdown of amounts in accumulated other comprehensive income expected to be amortized into net periodic benefit cost) (Details) (New) - Retirement Plans
$ in Millions
Dec. 31, 2019
USD ($)
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]  
Prior service cost/(credit) $ 0.2
Net actuarial loss/(gain) 3.0
Total $ 3.2