Goodwill and Other Intangible Assets - Schedule of Goodwill and Other Intangible Assets Footnotes (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Other Intangible Assets
Acquired Finite-Lived Intangible Assets [Line Items]
Finite Lived Intangible Assets, Foreign Currency Translation Gain (Loss)	$ 0.1	$ 0.2	$ (0.4)	$ 0.5
Goodwill
Acquired Finite-Lived Intangible Assets [Line Items]
Foreign currency translation	$ 0.7	$ (1.2)	(1.8)	$ 0.0
NSM Holding Co LLC | Goodwill
Acquired Finite-Lived Intangible Assets [Line Items]
Foreign currency translation			(1.8)		$ 1.4
NSM Holding Co LLC | Other Intangible Assets
Acquired Finite-Lived Intangible Assets [Line Items]
Finite Lived Intangible Assets, Foreign Currency Translation Gain (Loss)			$ (0.4)		$ 0.7