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Retirement Benefit Plans (Schedule of benefit obligations in excess of plan assets) (Details) - Retirement Plans - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Accumulated and projected benefit obligation $ 540.1 $ 467.3
Fair value of plan assets $ 512.8 $ 418.6