Restructuring, Impairment and Transaction-Related Charges (Schedule of Restructuring Reserves) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Restructuring Cost and Reserve [Line Items]
Gains on the sale of facilities	$ 8.4
Other restructuring charges	4.4	$ 44.6	$ 18.4
Restructuring Reserve [Roll Forward]
Balance, beginning of year	27.8	29.5
Expense, net	89.4	103.3	59.9
Cash payments, net	(77.6)	(43.8)
Non-cash adjustments/reclassifications	(15.1)	(61.2)
Balance, end of year	24.5	27.8	29.5
Facilities Idled
Restructuring Cost and Reserve [Line Items]
Vacant facility carrying costs and lease exit charges	9.5	16.9	18.1
Equipment and Infrastructure Removal Charges
Restructuring Cost and Reserve [Line Items]
Equipment and infrastructure removal costs	0.4	1.4	1.9
Sale of facilities
Restructuring Cost and Reserve [Line Items]
Gains on the sale of facilities	(6.1)	(17.3)	(7.1)
Other restructuring charges
Restructuring Cost and Reserve [Line Items]
Other restructuring activities	0.6	43.6	5.5
Employee Termination Charges
Restructuring Reserve [Roll Forward]
Balance, beginning of year	9.3	17.6
Expense, net	22.2	23.0
Cash payments, net	(20.0)	(28.7)
Non-cash adjustments/reclassifications	(1.6)	(2.6)
Balance, end of year	9.9	9.3	17.6
Impairment Charges
Restructuring Reserve [Roll Forward]
Balance, beginning of year	0.0	0.0
Expense, net	7.9	26.2
Cash payments, net	0.0	0.0
Non-cash adjustments/reclassifications	(7.9)	(26.2)
Balance, end of year	0.0	0.0	0.0
Transaction-Related Charges (Income)
Restructuring Reserve [Roll Forward]
Balance, beginning of year	1.2	0.4
Expense, net	51.6	8.2
Cash payments, net	(52.6)	(7.4)
Non-cash adjustments/reclassifications	0.6	0.0
Balance, end of year	0.8	1.2	0.4
Integration Costs
Restructuring Reserve [Roll Forward]
Balance, beginning of year	0.2	0.2
Expense, net	3.3	1.3
Cash payments, net	(3.2)	(1.1)
Non-cash adjustments/reclassifications	(0.1)	(0.2)
Balance, end of year	0.2	0.2	0.2
Other Restructuring Charges
Restructuring Reserve [Roll Forward]
Balance, beginning of year	17.1	11.3
Expense, net	4.4	44.6
Cash payments, net	(1.8)	(6.6)
Non-cash adjustments/reclassifications	(6.1)	(32.2)
Balance, end of year	$ 13.6	$ 17.1	$ 11.3