Annual report pursuant to Section 13 and 15(d)

Nature of Operations - Sales by Geographic Region (Details)

v3.20.1
Nature of Operations - Sales by Geographic Region (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Net sales $ 141.3 $ 165.6 $ 177.7 $ 141.7 $ 153.8 $ 208.9 $ 201.2 $ 164.3 $ 626.3 $ 728.2 $ 704.1
United States                      
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Net sales                 474.4 563.4 549.9
CHINA                      
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Net sales                 68.4 68.7 59.3
CANADA                      
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Net sales                 37.9 49.2 48.6
Other                      
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Net sales                 $ 45.6 $ 46.9 $ 46.3