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Benefit Plans (Allocation of Plan Assets) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Defined Benefit Plan Disclosure [Line Items]    
Defined Benefit Plan, Fair Value of Plan Assets $ 188.9 $ 322.3
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 $ 321.3
Level 2 [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Defined Benefit Plan, Fair Value of Plan Assets 0.6 1.0
Cash [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Defined Benefit Plan, Fair Value of Plan Assets 0.6 1.1
Cash [Member] | Level 1 [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Defined Benefit Plan, Fair Value of Plan Assets $ 0.6 $ 1.1
Equity Securities [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Weighted average asset allocations 62.00% 63.00%
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 $ 79.2 $ 142.3
Indexed Mutual Funds [Member] | Level 1 [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Defined Benefit Plan, Fair Value of Plan Assets 79.2 142.3
International Mutual Funds [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Defined Benefit Plan, Fair Value of Plan Assets 37.7 58.7
International Mutual Funds [Member] | Level 1 [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Defined Benefit Plan, Fair Value of Plan Assets $ 37.7 $ 58.7
Debt Securities [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Weighted average asset allocations 35.00% 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 3.00% 2.00%
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 $ 63.0 $ 111.4
Mutual Funds [Member] | Level 1 [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Defined Benefit Plan, Fair Value of Plan Assets 63.0 111.4
Insurance Contract [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Defined Benefit Plan, Fair Value of Plan Assets 0.6 1.0
Insurance Contract [Member] | Level 2 [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Defined Benefit Plan, Fair Value of Plan Assets 0.6 1.0
Balanced Mutual Fund [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Defined Benefit Plan, Fair Value of Plan Assets 7.8 7.8
Balanced Mutual Fund [Member] | Level 1 [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Defined Benefit Plan, Fair Value of Plan Assets $ 7.8 $ 7.8