XML 53 R87.htm IDEA: XBRL DOCUMENT v3.19.3.a.u2
Retirement Benefits - Estimated Future Benefit Payments (Details)
$ in Millions
Dec. 31, 2019
USD ($)
Pension Benefits  
Defined Benefit Plan Disclosure [Line Items]  
2020 $ 53.9
2021 53.2
2022 54.8
2023 55.3
2024 55.2
2025-2028 270.3
Other Benefits  
Defined Benefit Plan Disclosure [Line Items]  
2020 2.2
2021 2.1
2022 2.0
2023 1.9
2024 1.8
2025-2028 $ 7.5