Retirement Benefits - Pretax Amounts Recognized in Accumulated Other Comprehensive Income Loss (Details) $ in Millions	12 Months Ended
	Dec. 31, 2023 USD ($)
Pension Benefits | U.S. Plans
Defined Benefit Plan Disclosure [Line Items]
Net loss in current year	$ (0.9)
Prior service cost	(0.1)
Amortization of prior service credit	0.0
Amortization of net loss (gain)	0.1
Exchange rate effect on amounts in other comprehensive income	0.0
Total	(0.9)
Pension Benefits | Non-U.S. Plans
Defined Benefit Plan Disclosure [Line Items]
Net loss in current year	(6.9)
Prior service cost	0.0
Amortization of prior service credit	(0.1)
Amortization of net loss (gain)	(0.5)
Exchange rate effect on amounts in other comprehensive income	0.1
Total	(7.4)
Other Benefits
Defined Benefit Plan Disclosure [Line Items]
Net loss in current year	(0.4)
Prior service cost	0.0
Amortization of prior service credit	(0.1)
Amortization of net loss (gain)	(0.9)
Exchange rate effect on amounts in other comprehensive income	0.0
Total	$ (1.4)