Retirement Benefits - Amounts in Accumulated Other Comprehensive Income Loss Expected to be Recognized as Components of Net Periodic Benefit Cost (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Pension Benefits | U.S.
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Prior service cost (credit)	$ 0.1	$ 0.2
Net loss (gain)	2.1	13.4
Total	2.2	13.6
Pension Benefits | Non-U.S.
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Prior service cost (credit)	(0.5)	(0.1)
Net loss (gain)	12.6	24.5
Total	12.1	24.4
Other Benefits
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Prior service cost (credit)	(0.5)	(2.9)
Net loss (gain)	(3.0)	(2.3)
Total	$ (3.5)	$ (5.2)