Stock-Based Compensation (Components Of Stock-Based Compensation) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation	$ 35.5	$ 36.6	$ 37.1
Recognized tax benefits on stock-based compensation expense	9.0	17.2	26.3
To Be Settled With Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation expense	21.5	20.3	22.2
Employee contributions for above stock plans	14.0	16.3	14.9
Total stock-based compensation	35.5	36.6	37.1
Recognized tax benefits on stock-based compensation expense	5.1	7.3	8.1
To Be Settled With Stock | Amortization of the grant date fair value
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation expense	0.0	0.0	1.0
To Be Settled With Stock | Cash payments in lieu of options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation expense	0.0	0.0	0.0
To Be Settled With Stock | Stock-based retirement plans contributions
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation expense	5.6	5.5	6.7
To Be Settled With Stock | Deferred Stock Compensation Program
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation expense	1.9	2.1	2.0
To Be Settled With Stock | Stock-based retirement plans
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation expense	1.3	1.4	1.5
To Be Settled With Stock | Discount Stock Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation expense	1.1	1.1	1.0
To Be Settled With Stock | Performance Stock Unit Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation expense	3.6	5.4	4.8
To Be Settled With Stock | Performance Stock Unit Awards - TSR Based
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation expense	1.2	0.0	0.0
To Be Settled With Stock | Performance Stock Unit Awards - EBIT CAGR Based
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation expense	2.9	0.0	0.0
To Be Settled With Stock | PGI
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation expense	0.9	1.4	1.4
To Be Settled With Stock | Restricted Stock Unit Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation expense	2.1	2.5	2.8
To Be Settled With Stock | Other, primarily non-employee directors restricted stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation expense	0.9	0.9	1.0
To Be Settled In Cash
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation expense	3.9	1.2	9.8
To Be Settled In Cash | Amortization of the grant date fair value
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation expense	0.0	0.0	0.0
To Be Settled In Cash | Cash payments in lieu of options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation expense	0.0	0.0	1.0
To Be Settled In Cash | Stock-based retirement plans contributions
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation expense	1.0	1.2	1.3
To Be Settled In Cash | Deferred Stock Compensation Program
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation expense	0.0	0.0	0.0
To Be Settled In Cash | Stock-based retirement plans
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation expense	0.0	0.0	0.0
To Be Settled In Cash | Discount Stock Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation expense	0.0	0.0	0.0
To Be Settled In Cash | Performance Stock Unit Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation expense	(1.3)	(1.4)	6.5
To Be Settled In Cash | Performance Stock Unit Awards - TSR Based
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation expense	0.8	0.0	0.0
To Be Settled In Cash | Performance Stock Unit Awards - EBIT CAGR Based
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation expense	2.5	0.0	0.0
To Be Settled In Cash | PGI
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation expense	0.9	1.4	1.0
To Be Settled In Cash | Restricted Stock Unit Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation expense	0.0	0.0	0.0
To Be Settled In Cash | Other, primarily non-employee directors restricted stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation expense	0.0	0.0	0.0
Accounting Standards Update 2016-09 | To Be Settled With Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Recognized tax benefits on stock-based compensation expense	$ 3.9	$ 9.9	$ 18.2