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Employee Retirement Benefits - Fair Value of Plan Assets (Details) - Pension - USD ($)
$ in Millions
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Defined benefit plan, plan assets, amount $ 112.9 $ 156.4 $ 157.5
Level 1 | Cash      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Defined benefit plan, plan assets, amount 3.1 2.0  
Level 2 | Total Plan Assets, Excluding Assets Expected to be Transferred in      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Defined benefit plan, plan assets, amount 112.9 156.4  
Level 2 | Short Term Investments      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Defined benefit plan, plan assets, amount 1.4 1.4  
Level 2 | U.S. Large Cap      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Defined benefit plan, plan assets, amount 12.2 16.1  
Level 2 | U.S. Mid Cap      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Defined benefit plan, plan assets, amount 1.8 2.7  
Level 2 | U.S. Small Cap      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Defined benefit plan, plan assets, amount 0.2 1.2  
Level 2 | International Developed      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Defined benefit plan, plan assets, amount 10.2 15.2  
Level 2 | International Emerging Markets      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Defined benefit plan, plan assets, amount 3.4 3.9  
Level 2 | U.S. Treasuries      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Defined benefit plan, plan assets, amount 20.7 28.7  
Level 2 | Corporate Bonds      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Defined benefit plan, plan assets, amount 36.0 53.0  
Level 2 | Government Bonds      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Defined benefit plan, plan assets, amount 7.0 9.4  
Level 2 | Municipal Bonds      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Defined benefit plan, plan assets, amount 2.2 3.3  
Level 2 | Mortgage-Backed Securities      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Defined benefit plan, plan assets, amount 0.2 2.3  
Level 2 | Asset-Backed Securities      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Defined benefit plan, plan assets, amount 1.1 1.1  
Level 2 | Bank Loans      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Defined benefit plan, plan assets, amount 5.4 7.9  
Level 2 | Preferreds      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Defined benefit plan, plan assets, amount 5.9 7.7  
Level 2 | Other      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Defined benefit plan, plan assets, amount $ 2.1 $ 0.5