Pension Benefits and Postretirement Benefits Other Than Pensions (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Service Cost	$ 2.2	$ 2.7	$ 4.4	$ 5.4
Interest Cost on Projected Benefit Obligation	6.2	5.7	12.4	11.2
Expected Return on Plan Assets	(8.8)	(7.5)	(17.5)	(14.9)
Amortization of Accumulated Unrecognized Actuarial Loss	2.5	7.2	4.8	13.1
Total Expense Recognized	2.1	8.1	4.1	14.8
Postretirement Benefits Other than Pensions [Member]
Defined Benefit Plan Disclosure [Line Items]
Service Cost	0	0	0.1	0.1
Interest Cost on Projected Benefit Obligation	0.3	0.3	0.6	0.6
Amortization of Accumulated Unrecognized Actuarial Loss	(0.6)	(0.3)	(0.9)	(0.6)
Total Expense Recognized	$ (0.3)	$ 0	$ (0.2)	$ 0.1