Segment Information - Net Sales by Major Country (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Revenue, Major Customer
Total net sales	$ 1,853.7	$ 1,835.9	$ 1,961.0
Sales Revenue, Net | Geographic Concentration Risk | United States
Revenue, Major Customer
Total net sales	485.3	448.7	477.4
Sales Revenue, Net | Geographic Concentration Risk | China
Revenue, Major Customer
Total net sales	347.9	328.3	367.4
Sales Revenue, Net | Geographic Concentration Risk | Other countries
Revenue, Major Customer
Total net sales	$ 1,020.5	$ 1,058.9	$ 1,116.2