Benefit Plans, Pension Obligation and Funded Status (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Benefit Plans [Abstract]
Employee vesting period for defined benefit plans	5 years
Employer Contributions [Abstract]
Maximum percentage of total benefit obligation represented by international pension plans	22.00%
Change in plan assets [Roll Forward]
Beginning fair value	$ 340.0
Ending fair value	358.2	$ 340.0
Pension Benefits [Member]
Change in benefit obligations [Roll Forward]
Beginning projected benefit obligation	484.4	416.3
Service cost	7.7	6.8	$ 8.1
Interest cost	10.5	14.0	13.0
Actuarial (gain)/loss	56.5	63.9
Benefits paid	(12.3)	(18.6)
Settlements	(18.4)	(0.5)
Foreign exchange impact	5.5	2.1
Other	0.4	0.4
Ending projected benefit obligation	534.3	484.4	416.3
Change in plan assets [Roll Forward]
Beginning fair value	340.0	296.7
Actual return on plan assets	31.1	52.4
Employer contributions	11.8	7.7
Plan participants' contributions	0.3	0.4
Benefits paid	(12.2)	(18.6)
Settlements	(16.9)	(0.2)
Foreign exchange impact	4.1	1.6
Ending fair value	358.2	340.0	296.7
Defined benefit plan, funded (unfunded) status of plan [Abstract]
Funded status of the plan	(176.1)	(144.4)
Post-Retirement Benefits [Member]
Change in benefit obligations [Roll Forward]
Beginning projected benefit obligation	5.9	5.7
Service cost	0.2	0.2	0.2
Interest cost	0.2	0.2	0.2
Actuarial (gain)/loss	(1.3)	0.3
Benefits paid	(0.4)	(0.5)
Settlements	0.0	0.0
Foreign exchange impact	0.0	0.0
Other	0.0	0.0
Ending projected benefit obligation	4.6	5.9	5.7
Change in plan assets [Roll Forward]
Beginning fair value	0.0	0.0
Actual return on plan assets	0.0	0.0
Employer contributions	0.4	0.5
Plan participants' contributions	0.0	0.0
Benefits paid	(0.4)	(0.5)
Settlements	0.0	0.0
Foreign exchange impact	0.0	0.0
Ending fair value	0.0	0.0	$ 0.0
Defined benefit plan, funded (unfunded) status of plan [Abstract]
Funded status of the plan	$ (4.6)	$ (5.9)