Benefit Plans, Pension Obligation and Funded Status (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Benefit Plans [Abstract]
Employee vesting period for defined benefit plans	5 years
Employer Contributions [Abstract]
Maximum percentage of total benefit obligation for international pension plans	25.00%
Change in plan assets [Roll Forward]
Beginning fair value	$ 320.2
Ending fair value	296.7	$ 320.2
Pension Benefits [Member]
Change in benefit obligations [Roll Forward]
Beginning projected benefit obligation	469.5	427.9
Service cost	8.1	7.9	$ 8.2
Interest cost	13.0	12.6	13.0
Actuarial (gain)/loss	(40.5)	31.5
Benefits paid	(12.2)	(20.4)
Settlements	(17.1)	0.0
Foreign exchange impact	(5.1)	9.6
Other	0.6	0.4
Ending projected benefit obligation	416.3	469.5	427.9
Change in plan assets [Roll Forward]
Beginning fair value	320.2	289.3
Actual return on plan assets	(13.6)	33.8
Employer contributions	24.2	10.7
Plan participants' contributions	0.4	0.4
Benefits paid	(12.2)	(20.4)
Settlements	(18.2)	(0.8)
Foreign exchange impact	(4.1)	7.2
Ending fair value	296.7	320.2	289.3
Defined benefit plan, funded (unfunded) status of plan [Abstract]
Funded status of the plan	(119.6)	(149.3)
Post-retirement Benefits [Member]
Change in benefit obligations [Roll Forward]
Beginning projected benefit obligation	6.9	9.3
Service cost	0.2	0.3	0.3
Interest cost	0.2	0.3	0.3
Actuarial (gain)/loss	(1.5)	(3.0)
Benefits paid	(0.1)	(0.1)
Settlements	0.0	0.0
Foreign exchange impact	0.0	0.1
Other	0.0	0.0
Ending projected benefit obligation	5.7	6.9	9.3
Change in plan assets [Roll Forward]
Beginning fair value	0.0	0.0
Actual return on plan assets	0.0	0.0
Employer contributions	0.1	0.1
Plan participants' contributions	0.0	0.0
Benefits paid	(0.1)	(0.1)
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	$ (5.7)	$ (6.9)