Retirement Benefits (Components Of Net Periodic Benefit Cost, Other Changes In Plan Assets And Benefit Obligations Recognized In Other Comprehensive Loss And Assumptions Used In Measurement Of Postretirement Benefits) (Details) (Other Postretirement Benefit Plans Defined Benefit [Member], USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Other Postretirement Benefit Plans Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 0	$ 0	$ 1.0
Interest cost	0.8	1.0	1.8
Expected return on plan assets	(0.8)	(0.8)	(0.8)
Amortization of prior service cost	0	(26.3)	(0.4)
Amortization of net actuarial loss	0	5.7	0
Curtailment loss	0	0	0
Net periodic benefit cost	0	(20.4)	1.6
Net loss	(5.9)	(3.3)	5.5
Prior service cost	0	0	(25.2)
Amortization of prior service cost	0	26.3	0.4
Amortization of net actuarial loss	0	(5.8)	0
Total recognized in other comprehensive income	(5.9)	17.2	(19.3)
Total recognized in net periodic benefit cost and other comprehensive income	$ (5.9)	$ (3.2)	$ (17.7)
Assumptions used for net periodic benefit cost, Discount rate	4.80%	4.00%	4.50%
Assumptions used for net periodic benefit cost, Expected return on plan assets	4.20%	4.20%	4.20%
Assumptions used to determine benefit obligations, Discount rate	4.10%	4.80%	4.00%