Retirement Benefits - Reconciliation of Changes in Benefit Obligations and Fair Value of Plan Assets (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
CHANGE IN BENEFIT OBLIGATION
Actuarial loss (gain)			$ (9.7)
CHANGE IN PLAN ASSETS
Fair value of plan assets at January 1	$ 42.5
Fair value of plan assets at December 31	46.0	$ 42.5
COMPONENTS ON THE CONSOLIDATED BALANCE SHEETS
Other noncurrent liabilities	(65.1)	(55.1)
Pension Benefits
CHANGE IN BENEFIT OBLIGATION
Other	0.4
Pension Benefits | U.S.
CHANGE IN BENEFIT OBLIGATION
Obligation at January 1	8.3	10.6
Service cost	0.1	0.1	0.1
Interest cost	0.4	0.2	0.3
Plan amendments	0.0	0.0
Benefits paid	(0.7)	(0.6)
Actuarial loss (gain)	0.4	(2.0)
Currency translation	0.0	0.0
Settlements	0.0	0.0
Curtailments	0.0	0.0
Acquisition/Divestiture	0.0	0.0
Other		0.0
Obligation at December 31	8.9	8.3	10.6
CHANGE IN PLAN ASSETS
Fair value of plan assets at January 1	4.7	17.0
Actual return on plan assets	(0.3)	(2.0)
Employer contributions	0.4	0.4
Benefits paid	(0.7)	(0.6)
Currency translation	0.0	0.0
Settlements	0.0	0.0
Acquisition/Divestiture	0.0	0.0
Other	0.2	(10.1)
Fair value of plan assets at December 31	4.3	4.7	17.0
Funded status at December 31	(4.6)	(3.6)
COMPONENTS ON THE CONSOLIDATED BALANCE SHEETS
Other current assets	0.0	0.0
Other noncurrent assets	0.0	0.0
Current liabilities	(0.7)	(0.7)
Other noncurrent liabilities	(3.9)	(2.9)
Net asset (liability) at December 31	(4.6)	(3.6)
Pension Benefits | Non-U.S.
CHANGE IN BENEFIT OBLIGATION
Obligation at January 1	75.7	104.3
Service cost	1.2	1.8	2.0
Interest cost	2.8	1.0	0.7
Plan amendments	0.0	0.0
Benefits paid	(1.4)	(0.8)
Actuarial loss (gain)	6.2	(27.8)
Currency translation	5.2	(6.1)
Settlements	(3.0)	(0.1)
Curtailments	0.0	0.0
Acquisition/Divestiture	1.0	2.7
Other	0.8	0.7
Obligation at December 31	88.5	75.7	104.3
CHANGE IN PLAN ASSETS
Fair value of plan assets at January 1	37.8	46.1
Actual return on plan assets	0.9	(10.5)
Employer contributions	3.3	2.8
Benefits paid	(1.4)	(0.8)
Currency translation	3.2	(2.5)
Settlements	(3.0)	(0.1)
Acquisition/Divestiture	0.0	2.0
Other	0.9	0.8
Fair value of plan assets at December 31	41.7	37.8	46.1
Funded status at December 31	(46.8)	(37.9)
COMPONENTS ON THE CONSOLIDATED BALANCE SHEETS
Other current assets	0.0	0.0
Other noncurrent assets	1.5	0.5
Current liabilities	(1.7)	(1.5)
Other noncurrent liabilities	(46.6)	(36.9)
Net asset (liability) at December 31	(46.8)	(37.9)
Other Benefits
CHANGE IN BENEFIT OBLIGATION
Obligation at January 1	16.4	23.6
Service cost	0.4	0.7	0.7
Interest cost	0.8	0.5	0.4
Plan amendments	0.0	0.0
Benefits paid	(0.9)	(1.0)
Actuarial loss (gain)	0.5	(7.3)
Currency translation	0.0	(0.1)
Settlements	0.0	0.0
Curtailments	0.0	0.0
Acquisition/Divestiture	0.0	0.0
Other	0.0	0.0
Obligation at December 31	17.2	16.4	23.6
CHANGE IN PLAN ASSETS
Fair value of plan assets at January 1	0.0	0.0
Actual return on plan assets	0.0	0.0
Employer contributions	0.9	1.0
Benefits paid	(0.9)	(1.0)
Currency translation	0.0	0.0
Settlements	0.0	0.0
Acquisition/Divestiture	0.0	0.0
Other	0.0	0.0
Fair value of plan assets at December 31	0.0	0.0	$ 0.0
Funded status at December 31	(17.2)	(16.4)
COMPONENTS ON THE CONSOLIDATED BALANCE SHEETS
Other current assets	0.0	0.0
Other noncurrent assets	0.0	0.0
Current liabilities	(1.1)	(1.1)
Other noncurrent liabilities	(16.1)	(15.3)
Net asset (liability) at December 31	$ (17.2)	$ (16.4)