Restructuring and Restructuring Related Charges Restructuring and Restructuring Related Charges (Expected vs Incurred Costs) (Details) - USD ($) $ in Millions	12 Months Ended			24 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2019
Restructuring Cost and Reserve [Line Items]
Restructuring and restructuring-related	$ 8.1	$ 7.8	$ 0.8
Impairment costs associated with this plan	7.8	5.4	$ 4.9
Amount of total that represents cash charges	11.1	1.4
2018 Restructuring Plan
Restructuring Cost and Reserve [Line Items]
Restructuring and restructuring-related	7.5	11.2		$ 18.7
Impairment costs associated with this plan	7.6	5.1		12.7
Total Amount Incurred	15.1	16.3		31.4
Amount of total that represents cash charges	$ 8.0	$ 6.9		$ 14.9