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Summary of Significant Accounting Policies - Goodwill and Other Intangible Assets (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Sep. 30, 2019
Jun. 30, 2019
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Goodwill and Other Intangible Assets          
Goodwill wrote off $ 3.5   $ 3.5    
Impairment loss for goodwill       $ 0.0  
Impairment losses of indefinite-lived intangible assets     0.0 0.0  
Goodwill, Gross     28.0 31.5  
Goodwill, Net     28.0 31.5  
Total goodwill and other intangible assets, Gross     163.6 175.9  
Other intangible assets, Accumulated Amortization     (5.3) (5.1)  
Total goodwill and other intangible assets, Net     158.3 170.8  
Amortization expense     0.2 0.1 $ 0.5
Maximum          
Amortization relating to other intangible assets          
2020     0.0    
2021     0.0    
2022     0.0    
2023     0.0    
2024     0.0    
Thereafter     1.0    
Technology, patents and trade names          
Goodwill and Other Intangible Assets          
Other intangible assets, Gross     6.7 6.7  
Other intangible assets, Accumulated Amortization     (5.3) (5.1)  
Other intangible assets, Net     1.4 1.6  
In-process research and development          
Goodwill and Other Intangible Assets          
Impairment charges   $ 8.8 8.8    
Other intangible assets, Gross     128.9 137.7  
Other intangible assets, Net     $ 128.9 $ 137.7