Pension, Health Care and Other Postretirement Benefits - Summary of the Fair Value of the Defined Benefit Pension Plan Assets (Details) - Defined Benefit Pension - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Defined Benefit Plan Disclosure [Line Items]
Total investments in fair value hierarchy	$ 232.1	$ 341.9	$ 356.4
Total investments	343.0	483.6	462.5
Fair Value Measured at NAV or Equivalent
Defined Benefit Plan Disclosure [Line Items]
Investments measured at NAV or its equivalent	110.9	141.7	106.1
Level 1
Defined Benefit Plan Disclosure [Line Items]
Total investments in fair value hierarchy	8.5	13.5	38.2
Level 2
Defined Benefit Plan Disclosure [Line Items]
Total investments in fair value hierarchy	223.6	328.4	318.2
Equity investments
Defined Benefit Plan Disclosure [Line Items]
Total investments in fair value hierarchy	80.1	133.1	134.9
Equity investments | Level 1
Defined Benefit Plan Disclosure [Line Items]
Total investments in fair value hierarchy	8.5	13.5	13.9
Equity investments | Level 2
Defined Benefit Plan Disclosure [Line Items]
Total investments in fair value hierarchy	71.6	119.6	121.0
Fixed income investments
Defined Benefit Plan Disclosure [Line Items]
Total investments in fair value hierarchy	117.6	172.1	182.3
Fixed income investments | Level 1
Defined Benefit Plan Disclosure [Line Items]
Total investments in fair value hierarchy			24.3
Fixed income investments | Level 2
Defined Benefit Plan Disclosure [Line Items]
Total investments in fair value hierarchy	117.6	172.1	158.0
Other assets
Defined Benefit Plan Disclosure [Line Items]
Total investments in fair value hierarchy	34.4	36.7	39.2
Other assets | Level 2
Defined Benefit Plan Disclosure [Line Items]
Total investments in fair value hierarchy	$ 34.4	$ 36.7	$ 39.2