Goodwill and Other Intangible Assets (Details) - USD ($) $ in Millions	Mar. 31, 2019	Dec. 31, 2018
Goodwill and Other Intangible Assets
Goodwill, Gross	$ 31.5	$ 31.5
Goodwill, Net	31.5	31.5
Total Goodwill and other intangible assets, Gross	175.9	175.9
Other intangible assets, Accumulated Amortization	(5.1)	(5.1)
Total goodwill and other intangible assets, Net	170.8	170.8
Technology, patents and trade names
Goodwill and Other Intangible Assets
Other intangible assets, Gross	6.7	6.7
Other intangible assets, Accumulated Amortization	(5.1)	(5.1)
Other intangible assets, Net	1.6	1.6
In-process research and development
Goodwill and Other Intangible Assets
Other intangible assets, Gross	137.7	137.7
Other intangible assets, Net	$ 137.7	$ 137.7