Pension Plans - Funded Status of Non-U.S. Plans (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
U.S. Pension Benefits
Change in pension benefit obligation:
Benefit obligation at beginning of year	$ 30.9	$ 33.7
Service cost	0.0	0.0	$ 0.0
Interest cost	1.3	1.2	0.3
Employee contributions	0.0	0.0
Benefits paid and other	(1.2)	(1.3)
Plan acquisitions	0.0	0.0
Actuarial loss (gain)	4.2	(2.7)
Amendments, settlements and curtailments	0.0	0.0
Foreign exchange rate impact	0.0	0.0
Benefit obligation at end of year	35.2	30.9	33.7
Change in plan assets:
Fair value of plan assets at beginning of year	23.3	25.8
Actual return on plan assets	3.9	(1.2)
Employer contributions	0.5	0.0
Employee contributions	0.0	0.0
Amendments and settlements	0.0	0.0
Benefits paid and other	(1.2)	(1.3)
Plan acquisitions	0.0	0.0
Foreign exchange rate impact	0.0	0.0
Fair value of plan assets at end of year	26.5	23.3	25.8
Funded status	(8.7)	(7.6)
Non-U.S. Pension Benefits
Change in pension benefit obligation:
Benefit obligation at beginning of year	274.3	300.8
Service cost	2.3	1.3	3.5
Interest cost	5.7	5.7	5.8
Employee contributions	0.9	0.2
Benefits paid and other	(8.7)	(9.5)
Plan acquisitions	25.1	0.0
Actuarial loss (gain)	39.3	(7.0)
Amendments, settlements and curtailments	(0.6)	(3.0)
Foreign exchange rate impact	1.2	(14.2)
Benefit obligation at end of year	339.5	274.3	300.8
Change in plan assets:
Fair value of plan assets at beginning of year	156.5	172.2
Actual return on plan assets	20.5	(3.1)
Employer contributions	10.9	9.8
Employee contributions	0.9	0.2
Amendments and settlements	(2.7)	(4.4)
Benefits paid and other	(8.7)	(9.5)
Plan acquisitions	17.8	0.0
Foreign exchange rate impact	2.4	(8.7)
Fair value of plan assets at end of year	197.6	156.5	$ 172.2
Funded status	$ (141.9)	$ (117.8)