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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
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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 |

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