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Restructuring Expenses Restructing Expenses - Narrative (Details) $ in Millions	3 Months Ended	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2020 USD ($) employees	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)
Restructuring Cost and Reserve [Line Items]
Ownership Interest of Controlling Interest	50.00%
Restructuring Charges Excluding Adjustments		$ 20.1	$ 9.7	$ 14.1
Restructuring and Related Cost, Number of Positions Eliminated \| employees		350
Loss on Sale of Joint Venture
Restructuring Cost and Reserve [Line Items]
Restructuring Charges Excluding Adjustments		$ 0.0	$ 2.1	$ 0.0