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Employee Benefits (Accumulated Benefit Obligations) (Details) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Retirement Benefits [Abstract]    
ABO Exceeds Assets $ 927.6 $ 1,223.9
Assets Exceed ABO 145.6 4.5
Projected benefit obligation 1,073.2 1,228.4
ABO Exceeds Assets 927.6 1,223.9
Assets Exceed ABO 145.6 4.2
Accumulated benefit obligation 1,073.2 1,228.1
ABO Exceeds Assets 726.6 993.0
Assets Exceed ABO 148.3 5.3
Fair value of plan assets $ 874.9 $ 998.3