Restructuring Charges - Narrative (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Restructuring Cost and Reserve [Line Items]
Restructuring charges		$ 68.0	$ 35.3	$ 7.3
Severance | 2020 Restructuring Plan
Restructuring Cost and Reserve [Line Items]
Restructuring charges		16.8
Severance | 2020 Restructuring Plan - Voluntary Early Retirement Program
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 46.0
Other Restructuring | 2020 Restructuring Plan
Restructuring Cost and Reserve [Line Items]
Asset impairment charges		$ 5.2