Retirement Benefit Plans - Accumulated Benefit Obligations (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
UNITED STATES | U.S. Nonqualified Plan
Defined Benefit Plan, Plan Assets, Category [Line Items]
Accumulated benefit obligation	$ 0.9	$ 1.1
Non-U.S. Plan | U.K. Pension Plan | Pension Plan
Defined Benefit Plan, Plan Assets, Category [Line Items]
Accumulated benefit obligation	6.5	11.4
Non-U.S. Plan | German Pension Plan | Pension Plan
Defined Benefit Plan, Plan Assets, Category [Line Items]
Accumulated benefit obligation	0.7	1.0
Non-U.S. Plan | French Pension Plan | Pension Plan
Defined Benefit Plan, Plan Assets, Category [Line Items]
Accumulated benefit obligation	0.5	0.0
Non-U.S. Plan | Italian Pension Plan | Pension Plan
Defined Benefit Plan, Plan Assets, Category [Line Items]
Accumulated benefit obligation	$ 2.4	$ 3.7