Employee Benefit Plans - Funded Status (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Change in benefit obligation:
Benefit obligation at beginning of year	$ 133.8	$ 121.0
Service cost	2.5	2.4	$ 2.2
Interest cost	3.8	4.2	4.1
Participant contributions	0.9	1.0
Actuarial (gain) loss	(6.6)	1.2
Benefits paid	(3.8)	(6.0)
Other, principally foreign exchange	(5.5)	10.0
Benefit obligation at end of year		133.8	121.0
Change in plan assets:
Fair value of plan assets at beginning of year	115.5	99.3
Actual (loss) gain on plan assets	(4.1)	10.4
Employer contributions	3.2	3.1
Participant contributions	0.9	1.0
Benefits paid	(3.8)	(6.0)
Other, principally foreign exchange	(4.8)	7.7
Fair value of assets at end of year	106.9	115.5	$ 99.3
Amounts recognized in the consolidated balance sheets:
Funded status (current)	0.0	0.0
Funded status (non-current)	(18.2)	(18.3)
Accumulated other comprehensive loss:
Unrecognized actuarial loss	24.7	20.6
Unrecognized prior service cost	0.5	0.5
Deferred taxes	(4.7)	(4.7)
Net amount recognized	2.3	(1.9)
Defined Benefit Plan, Accumulated Benefit Obligation	$ 125.1	$ 134.0