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Employee Benefits - Information for Pension Plans with ABO in Excess of Plan Assets (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Compensation And Retirement Disclosure [Abstract]    
ABO Exceeds Assets $ 960.9 $ 927.6
Assets Exceed ABO 167.9 145.6
Projected benefit obligation 1,128.8 1,073.2
ABO Exceeds Assets 960.9 927.6
Assets Exceed ABO 167.9 145.6
Accumulated benefit obligation 1,128.8 1,073.2
ABO Exceeds Assets 726.0 726.6
Assets Exceed ABO 174.0 148.3
Fair value of plan assets $ 900.0 $ 874.9