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Employee Benefit Plan (Pension Plans with Accumulated Benefit Obligations in Excess of Plan Assets) (Details) - USD ($)
$ in Millions
Jun. 30, 2017
Jun. 30, 2016
Compensation and Retirement Disclosure [Abstract]    
Projected benefit obligation $ 241.0 $ 165.7
Accumulated benefit obligation 227.9 148.2
Fair value of plan assets $ 98.9 $ 21.6