Segment Information - Countries Representing 10% or More in Net Sales and Long-Lived Assets (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
Revenue, Major Customer [Line Items]
Total	$ 478.4	$ 488.5	$ 501.6	$ 492.5	$ 488.6	$ 480.6	$ 462.3	$ 447.1	$ 1,961.0	$ 1,878.6	$ 1,770.1
Sales Revenue, Net | Geographic Concentration Risk | United States
Revenue, Major Customer [Line Items]
Total									477.4	451.4	457.1
Sales Revenue, Net | Geographic Concentration Risk | China
Revenue, Major Customer [Line Items]
Total									367.4	358.6	323.0
Sales Revenue, Net | Geographic Concentration Risk | Other countries
Revenue, Major Customer [Line Items]
Total									$ 1,116.2	$ 1,068.6	$ 990.0