Retirement, Postretirement And Other Benefit Plans (Schedule Of Net Periodic Benefit Cost And Other Amount Recognized in OCI) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Retirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 0.0	$ 0.1	$ 0.2
Interest cost	16.0	17.1	16.9
Expected return on plan assets	(19.3)	(18.5)	(20.1)
Amortization of prior service cost	0.0	0.0	0.0
Amortization of net loss/(gain)	1.6	2.9	2.6
Net settlement and curtailment (gain)/loss and special termination benefit	4.5	0.0	0.0
Net periodic benefit cost (credit)	2.8	1.6	(0.4)
Other Changes in Plan Assets and Benefit Obligations Recognized in Other Comprehensive Income
Net loss/(gain)	(17.1)	(5.0)	20.9
Amortization, settlement or curtailment recognition of net (loss)/gain	(1.5)	(2.9)	(2.6)
Amortization, settlement or curtailment recognition of prior service credit	0.0	0.0	0.0
Total recognized in OCI	(18.6)	(7.9)	18.3
Total recognized in net periodic benefit cost and OCI	(15.8)	(6.3)	17.9
Post-Retirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	0.0	0.0	0.0
Interest cost	1.2	1.4	1.4
Expected return on plan assets	0.0	0.0	0.0
Amortization of prior service cost	(0.5)	(0.5)	(0.5)
Amortization of net loss/(gain)	(1.0)	(0.7)	(0.3)
Net settlement and curtailment (gain)/loss and special termination benefit	0.0	0.0	0.0
Net periodic benefit cost (credit)	(0.3)	0.2	0.6
Other Changes in Plan Assets and Benefit Obligations Recognized in Other Comprehensive Income
Net loss/(gain)	0.5	0.9	(1.5)
Amortization, settlement or curtailment recognition of net (loss)/gain	1.1	0.7	0.3
Amortization, settlement or curtailment recognition of prior service credit	0.5	0.5	0.5
Total recognized in OCI	2.1	2.1	(0.7)
Total recognized in net periodic benefit cost and OCI	1.8	$ 2.3	$ (0.1)
Discontinued Operation | Retirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Net settlement and curtailment (gain)/loss and special termination benefit	$ 4.7