Pension Benefits - Components Of Comprehensive Pension Expense (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Defined Benefit Plan Disclosure [Line Items]
Unrecognized Pension Loss (Gain) Arising During the Year	$ 106.4	$ (61.6)	$ 29.4
Amortization of Accumulated Unrecognized Pension Loss	(7.9)	(25.0)	(16.2)
Pension Plans, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Service Cost Earned During the Year	8.7	10.8	10.8
Interest Cost on Projected Benefit Obligation	24.8	22.4	22.4
Expected Return on Plan Assets	(34.9)	(29.7)	(29.8)
Amortization of Actuarial Loss	9.7	26.2	18.8
Settlements	0	0	0.3
Pension Expense Recognized in Consolidated Statements of Income	8.3	29.7	22.5
Unrecognized Pension Loss (Gain) Arising During the Year	102.0	(53.8)	34.8
Prior Service Credit Arising During the Year	(0.6)	0	0
Amortization of Accumulated Unrecognized Pension Loss	(9.7)	(26.2)	(18.8)
Comprehensive Pension Expense (Income)	100.0	(50.3)	38.5
Amounts that will be amortized from AOCI in next Fiscal Year	23.0
Discontinued Operations [Member] | Pension Plans, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension Expense Recognized in Consolidated Statements of Income			$ 0.5