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Employee Benefit Plan (Pension Plans with Accumulated Benefit Obligations in Excess of Plan Assets) (Details) - USD ($)
$ in Millions
Jun. 30, 2018
Jun. 30, 2017
Retirement Benefits [Abstract]    
Projected benefit obligation $ 151.3 $ 241.0
Accumulated benefit obligation 138.1 227.9
Fair value of plan assets $ 13.3 $ 98.9