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Employee Retirement Plans (Tables)
9 Months Ended
Sep. 30, 2020
Retirement Benefits [Abstract]  
Schedule of Components of Net Pension Income
The components of net pension income for the three and nine months ended September 30, 2020 and 2019, were as follows:
Three Months Ended September 30,Nine Months Ended September 30,
2020201920202019
Interest cost$(3.4)$(4.4)$(10.2)$(13.2)
Expected return on plan assets6.1 5.9 18.2 17.7 
Net pension income$2.7 $1.5 $8.0 $4.5