Restructuring Activities - Summary of Statement of Operations Effects (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Restructuring Cost And Reserve [Line Items]
Restructuring charges	$ 41.9	$ 47.8	$ 12.1
Total expense	102.2	61.7	28.8
Capital expenditures	3.4	1.0	21.3
Share-based compensation expense	34.4	29.9	48.5
Continuing Operations
Restructuring Cost And Reserve [Line Items]
Other associated costs	60.3	13.9	14.3
Restructuring charges	41.9	47.8	12.1
Total expense	102.2	61.7	26.4
Share-based compensation expense		1.9
Discontinued Operations
Restructuring Cost And Reserve [Line Items]
Total expense	$ 0.0	$ 0.0	$ 2.4