Benefit Plans (Amounts Recognized in Other Comprehensive Income (Loss)) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Pension Benefits [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]
Net actuarial loss (gain)	$ 95.2	$ 140.0
Transition obligation	0.3	0.4
Prior service (credit) cost	(7.4)	(8.8)
Total	88.1	131.6
Other Retirement Benefits [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]
Net actuarial loss (gain)	(15.5)	2.3
Transition obligation	0	0
Prior service (credit) cost	0	0
Total	$ (15.5)	$ 2.3