Employees - Fair Value of Pension Assets by Category (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	$ 102.2	$ 137.9	$ 138.5
Quoted Prices in Active Markets For Identical Assets or Liabilities (Level 1)
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	0.0	0.0
Significant Other Observable Inputs (Level 2)
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	102.2	137.9
Significant Unobservable Inputs (Level 3)
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	0.0	0.0
U.S. companies
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	14.3	19.3
U.S. companies | Quoted Prices in Active Markets For Identical Assets or Liabilities (Level 1)
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	0.0	0.0
U.S. companies | Significant Other Observable Inputs (Level 2)
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	14.3	19.3
U.S. companies | Significant Unobservable Inputs (Level 3)
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	0.0	0.0
International companies
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	6.3	9.9
International companies | Quoted Prices in Active Markets For Identical Assets or Liabilities (Level 1)
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	0.0	0.0
International companies | Significant Other Observable Inputs (Level 2)
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	6.3	9.9
International companies | Significant Unobservable Inputs (Level 3)
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	0.0	0.0
Fixed-income
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	81.6	108.7
Fixed-income | Quoted Prices in Active Markets For Identical Assets or Liabilities (Level 1)
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	0.0	0.0
Fixed-income | Significant Other Observable Inputs (Level 2)
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	81.6	108.7
Fixed-income | Significant Unobservable Inputs (Level 3)
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	$ 0.0	$ 0.0