Pension and Savings Plans - Fair Value of Assets in the Master Trust by Asset (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Level 3
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, assets	$ 430.4	$ 0.3	$ 1.2	$ 4.1
Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, assets	583.3	772.4	$ 847.5
Pension Plan | Fair Value, Inputs, Level 1, 2 and 3
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, assets	536.2	735.0
Pension Plan | Fair Value, Inputs, Level 1, 2 and 3 | Corporate bonds
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, assets	67.2	537.5
Pension Plan | Fair Value, Inputs, Level 1, 2 and 3 | U.S. government securities
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, assets	26.1	147.7
Pension Plan | Fair Value, Inputs, Level 1, 2 and 3 | International government securities
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, assets	2.0	15.5
Pension Plan | Fair Value, Inputs, Level 1, 2 and 3 | Asset-backed securities
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, assets	0.7	3.3
Pension Plan | Fair Value, Inputs, Level 1, 2 and 3 | Cash funds
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, assets	9.8	30.7
Pension Plan | Fair Value, Inputs, Level 1, 2 and 3 | Real estate interests
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, assets	0.3	0.3
Pension Plan | Fair Value, Inputs, Level 1, 2 and 3 | Group annuity contract
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, assets	430.1
Pension Plan | Level 1
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, assets	33.1	155.9
Pension Plan | Level 1 | Corporate bonds
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, assets	0.0	0.0
Pension Plan | Level 1 | U.S. government securities
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, assets	23.3	125.2
Pension Plan | Level 1 | International government securities
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, assets	0.0	0.0
Pension Plan | Level 1 | Asset-backed securities
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, assets	0.0	0.0
Pension Plan | Level 1 | Cash funds
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, assets	9.8	30.7
Pension Plan | Level 1 | Real estate interests
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, assets	0.0	0.0
Pension Plan | Level 1 | Group annuity contract
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, assets	0.0
Pension Plan | Level 2
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, assets	72.7	578.8
Pension Plan | Level 2 | Corporate bonds
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, assets	67.2	537.5
Pension Plan | Level 2 | U.S. government securities
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, assets	2.8	22.5
Pension Plan | Level 2 | International government securities
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, assets	2.0	15.5
Pension Plan | Level 2 | Asset-backed securities
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, assets	0.7	3.3
Pension Plan | Level 2 | Cash funds
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, assets	0.0	0.0
Pension Plan | Level 2 | Real estate interests
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, assets	0.0	0.0
Pension Plan | Level 2 | Group annuity contract
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, assets	0.0
Pension Plan | Level 3
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, assets	430.4	0.3
Pension Plan | Level 3 | Corporate bonds
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, assets	0.0	0.0
Pension Plan | Level 3 | U.S. government securities
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, assets	0.0	0.0
Pension Plan | Level 3 | International government securities
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, assets	0.0	0.0
Pension Plan | Level 3 | Asset-backed securities
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, assets	0.0	0.0
Pension Plan | Level 3 | Cash funds
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, assets	0.0	0.0
Pension Plan | Level 3 | Real estate interests
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, assets	0.3	0.3
Pension Plan | Level 3 | Group annuity contract
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, assets	430.1
Pension Plan | Fair Value Measured at Net Asset Value Per Share | Private mutual funds
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, assets	$ 47.1	$ 37.4