Annual report pursuant to Section 13 and 15(d)

Nature of Operations - Sales by Geographic Region (Details)

v3.10.0.1
Nature of Operations - Sales by Geographic Region (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Net sales $ 153.8 $ 208.9 $ 201.2 $ 164.3 $ 159.4 $ 195.5 $ 188.4 $ 160.8 $ 728.2 $ 704.1 $ 710.1
United States                      
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Net sales                 563.4 549.9 565.3
CHINA                      
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Net sales                 68.7 59.3 51.2
CANADA                      
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Net sales                 49.2 48.6 51.5
Other                      
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Net sales                 $ 46.9 $ 46.3 $ 42.1