Retirement Benefits - Information Comparing Plan Assets to Plan Obligations (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Total
Information for pension plans with an ABO in excess of plan assets:
Fair value of plan assets	$ 681.2	$ 890.7
Accumulated benefit obligation	798.2	1,089.3
Projected benefit obligation	818.3	1,115.7
U.S. Plans
Information for pension plans with an ABO in excess of plan assets:
Fair value of plan assets	596.3	764.8
Accumulated benefit obligation	627.2	839.5
Projected benefit obligation	627.2	839.5
Non-U.S. Plans
Information for pension plans with an ABO in excess of plan assets:
Fair value of plan assets	84.9	125.9
Accumulated benefit obligation	171.0	249.8
Projected benefit obligation	$ 191.1	$ 276.2