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Employee Benefit Plans and Other Postretirement Benefits - Components of Net Periodic Benefit Costs (Details) - Pension Plans - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Defined Benefit Plan Disclosure [Line Items]        
Service cost $ 5.4 $ 5.9 $ 10.7 $ 11.9
Interest cost 7.4 10.0 14.9 19.9
Expected return on plan assets (15.8) (14.2) (31.6) (28.4)
Net amortization of unrecognized amounts, Prior service cost 1.0 1.1 1.9 2.2
Net amortization of unrecognized amounts, Actuarial loss (income) 2.5 2.7 5.0 5.3
Net periodic benefit cost $ 0.5 $ 5.5 $ 0.9 $ 10.9