Goodwill - Changes in Carrying Amount of Goodwill by Segment (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Goodwill [Roll Forward]
Balance at beginning of year	$ 177.8	$ 180.8
Translation adjustments	(0.6)	(3.0)
Balance at end of year	177.2	177.8
Services
Goodwill [Roll Forward]
Balance at beginning of year	69.1	72.1
Translation adjustments	(0.6)	(3.0)
Balance at end of year	68.5	69.1
Technology
Goodwill [Roll Forward]
Balance at beginning of year	108.7	108.7
Translation adjustments	0.0	0.0
Balance at end of year	$ 108.7	$ 108.7