Fair Value Measurements (Details 1) - Senior Notes Due 2023 - Senior Notes - USD ($) $ in Millions	Apr. 29, 2020	Mar. 31, 2020	Dec. 31, 2019
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of notes		$ 307.1	$ 1,060.0
Subsequent Event
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of notes	$ 499.5