Revenue - Narrative (Details) - USD ($) $ in Millions	Jan. 01, 2019	Jan. 01, 2018	Jan. 01, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Effect of accounting change on prior years	$ (0.1)	$ 2.3	$ (1.1)
Retained Earnings
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Effect of accounting change on prior years	$ (0.1)	2.3	$ (1.1)
Retained Earnings | Accounting Standards Update 2014-09
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Effect of accounting change on prior years		$ 2.3