XML 75 R65.htm IDEA: XBRL DOCUMENT v3.21.2
Note 13 - Pension and Postretirement Benefits - Components of Net Periodic Benefit Cost and Amounts Recognized in Other Comprehensive Income (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Pension Plan and SERP Plan [Member]        
Interest cost $ 2.7 $ 2.9 $ 8.3 $ 9.8
Expected return on plan assets (8.2) (7.9) (24.6) (22.3)
Amortization of net actuarial loss 1.0 1.7 2.9 4.6
Net periodic benefit (4.5) (3.3) (13.3) (7.8)
Employer contributions, net 0.2 0.2 0.6 0.6
Amortization of prior service cost (credit)     (0.1) (0.1)
Other Postretirement Benefits Plan [Member]        
Interest cost 0.0 0.0 0.1 0.1
Expected return on plan assets (0.1) (0.1) (0.2) (0.2)
Amortization of net actuarial loss 0.1 0.1 0.2 0.3
Net periodic benefit 0.0 0.0 0.0 0.1
Employer contributions, net $ 1.3 $ 0.1 1.7 0.9
Amortization of prior service cost (credit)     $ 0.1 $ 0.1