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Pension Benefits - Components Of Comprehensive Pension Expense (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Defined Benefit Plan Disclosure [Line Items]      
Unrecognized Pension Loss (Gain) Arising During the Year $ (3.0) $ 106.4 $ (61.6)
Amortization of Accumulated Unrecognized Pension Loss (23.1) (7.9) (25.0)
Pension Plans, Defined Benefit [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Service Cost Earned During the Year 10.5 8.7 10.8
Interest Cost on Projected Benefit Obligation 25.7 24.8 22.4
Expected Return on Plan Assets (35.0) (34.9) (29.7)
Amortization of Actuarial Loss 24.4 9.7 26.2
Pension Expense Recognized in Consolidated Statements of Income 25.6 8.3 29.7
Unrecognized Pension Loss (Gain) Arising During the Year (1.9) 102.0 (53.8)
Prior Service Credit Arising During the Year 0.0 (0.6) 0.0
Amortization of Accumulated Unrecognized Pension Loss (24.4) (9.7) (26.2)
Comprehensive Pension Expense (Income) (0.7) $ 100.0 $ (50.3)
Amounts that will be amortized from AOCI in next Fiscal Year $ 11.8