Retirement Benefits - Pretax Amounts Recognized in Accumulated Other Comprehensive Income Loss (Details) $ in Millions	12 Months Ended
	Dec. 31, 2021 USD ($)
Pension Benefits | U.S. Plans
Defined Benefit Plan Disclosure [Line Items]
Net gain (loss) in current year	$ 0.5
Prior service cost	0.0
Amortization of prior service cost (credit)	0.1
Amortization of net loss (gain)	10.8
Exchange rate effect on amounts in other comprehensive income	0.0
Total	11.4
Pension Benefits | Non-U.S. Plans
Defined Benefit Plan Disclosure [Line Items]
Net gain (loss) in current year	8.5
Prior service cost	0.5
Amortization of prior service cost (credit)	0.0
Amortization of net loss (gain)	2.1
Exchange rate effect on amounts in other comprehensive income	1.5
Total	12.6
Other Benefits
Defined Benefit Plan Disclosure [Line Items]
Net gain (loss) in current year	1.0
Prior service cost	0.0
Amortization of prior service cost (credit)	(2.4)
Amortization of net loss (gain)	(0.3)
Exchange rate effect on amounts in other comprehensive income	0.0
Total	$ (1.7)