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Pension Benefits - Changes in Fair Value of Pension Plans Level 3 (Details) - Pension Plans, Defined Benefit [Member] - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]    
Fair Value of Plan Assets at Beginning of Year $ 507.5 $ 543.0
Fair Value of Plan Assets at End of Year 520.9 507.5
Fair Value, Inputs, Level 3 [Member]    
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]    
Fair Value of Plan Assets at Beginning of Year 0.4 0.4
Return on Plan Assets Held 0.0 0.0
Purchases, Sales and Settlements, Net 0.0 0.0
Transfers out of Level 3 0.0 0.0
Fair Value of Plan Assets at End of Year 0.4 0.4
Receivables and Other [Member]    
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]    
Fair Value of Plan Assets at Beginning of Year 1.5  
Fair Value of Plan Assets at End of Year 1.8 1.5
Receivables and Other [Member] | Fair Value, Inputs, Level 3 [Member]    
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]    
Fair Value of Plan Assets at Beginning of Year 0.4  
Fair Value of Plan Assets at End of Year $ 0.4 $ 0.4