Restructuring Activities And Related Impairments - Schedule Of Restructuring And Related Costs (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Restructuring Reserve [Roll Forward]
Balance at beginning of year	$ 5.6	$ 11.4	$ 20.0
Costs incurred	89.3	13.0	23.7
Paid/settled	(59.0)	(18.8)	(32.3)
Balance at end of year	35.9	5.6	11.4
Employee Severance and Related
Restructuring Reserve [Roll Forward]
Balance at beginning of year	5.6	10.3	19.9
Costs incurred	78.3	12.9	21.7
Paid/settled	(53.4)	(17.6)	(31.3)
Balance at end of year	30.5	5.6	10.3
Facility Exit and Related
Restructuring Reserve [Roll Forward]
Balance at beginning of year	0.0	1.1	0.1
Costs incurred	11.0	0.1	2.0
Paid/settled	(5.6)	(1.2)	(1.0)
Balance at end of year	$ 5.4	$ 0.0	$ 1.1