Employee Benefit Plans - Funded Status (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Change in plan assets:
Fair value of plan assets at beginning of year	$ 104.5
Fair value of assets at end of year	99.3	$ 104.5
Defined benefit pension plans
Change in benefit obligation:
Benefit obligation at beginning of year	115.1	126.6
Service cost	2.2	2.5	$ 2.2
Interest cost	4.1	4.3	4.9
Participant contributions	0.9	1.0
Curtailments	0.2	0.0
Actuarial loss (gain)	17.2	(6.0)
Benefits paid	(3.0)	(2.1)
Settlement payments	(3.8)	0.0
Other, principally foreign exchange	(11.9)	(11.2)
Benefit obligation at end of year	121.0	115.1	126.6
Change in plan assets:
Fair value of plan assets at beginning of year	104.5	106.4
Actual gain on plan assets	4.8	6.3
Employer contributions	2.8	2.6
Participant contributions	0.9	1.0
Benefits paid	(3.0)	(2.1)
Other, principally foreign exchange	(10.7)	(9.7)
Fair value of assets at end of year	99.3	104.5	$ 106.4
Amounts recognized in the consolidated balance sheets:
Funded status (current)	0.0	0.0
Funded status (non-current)	(21.6)	(10.5)
Accumulated other comprehensive loss:
Unrecognized actuarial loss	28.3	13.9
Unrecognized prior service cost	(3.7)	(2.2)
Deferred taxes	(4.9)	(1.7)
Net amount recognized	$ (1.9)	$ (0.5)