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Benefit Plans (Allocation of Plan Assets) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Defined Benefit Plan Disclosure [Line Items]    
Defined Benefit Plan, Fair Value of Plan Assets $ 192.4 $ 188.9
Weighted average asset allocations 100.00% 100.00%
Level 1 [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Defined Benefit Plan, Fair Value of Plan Assets   $ 188.3
Level 2 [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Defined Benefit Plan, Fair Value of Plan Assets   0.6
Cash [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Defined Benefit Plan, Fair Value of Plan Assets $ 10.0 0.6
Cash [Member] | Level 1 [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Defined Benefit Plan, Fair Value of Plan Assets $ 10.0 $ 0.6
Equity Securities [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Weighted average asset allocations 60.00% 62.00%
Target allocation 65.00%  
Allocation range minimum 60.00%  
Allocation range maximum 70.00%  
Indexed Mutual Funds [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Defined Benefit Plan, Fair Value of Plan Assets $ 8.9 $ 79.2
Indexed Mutual Funds [Member] | Level 1 [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Defined Benefit Plan, Fair Value of Plan Assets 8.9 79.2
International Mutual Funds [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Defined Benefit Plan, Fair Value of Plan Assets 3.0 37.7
International Mutual Funds [Member] | Level 1 [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Defined Benefit Plan, Fair Value of Plan Assets $ 3.0 $ 37.7
Debt Securities [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Weighted average asset allocations 30.00% 35.00%
Target allocation 35.00%  
Allocation range minimum 30.00%  
Allocation range maximum 40.00%  
Other [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Weighted average asset allocations 10.00% 3.00%
Target allocation 0.00%  
Allocation range minimum 0.00%  
Allocation range maximum 5.00%  
Mutual Funds [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Defined Benefit Plan, Fair Value of Plan Assets $ 9.2 $ 63.0
Mutual Funds [Member] | Level 1 [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Defined Benefit Plan, Fair Value of Plan Assets 9.2 63.0
Insurance Contract [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Defined Benefit Plan, Fair Value of Plan Assets 0.5 0.6
Insurance Contract [Member] | Level 2 [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Defined Benefit Plan, Fair Value of Plan Assets 0.5 0.6
Balanced Mutual Fund [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Defined Benefit Plan, Fair Value of Plan Assets 6.3 7.8
Balanced Mutual Fund [Member] | Level 1 [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Defined Benefit Plan, Fair Value of Plan Assets 6.3 $ 7.8
Pension Plan Assets In The Fair Value Hierarchy [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Defined Benefit Plan, Fair Value of Plan Assets 37.9  
Pension Plan Assets In The Fair Value Hierarchy [Member] | Level 1 [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Defined Benefit Plan, Fair Value of Plan Assets 37.4  
Pension Plan Assets In The Fair Value Hierarchy [Member] | Level 2 [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Defined Benefit Plan, Fair Value of Plan Assets 0.5  
Pension plan assets measured at NAV [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Defined Benefit Plan, Fair Value of Plan Assets $ 154.5