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Employee Benefit Plans (Fair Value Measurements Classified as Level 3) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Changes in Plan Assets:    
Beginning fair value of plan assets $ 186.6  
Ending fair value of plan assets 169.8 $ 186.6
Fair Value, Inputs, Level 3 [Member]    
Changes in Plan Assets:    
Beginning fair value of plan assets 3.7  
Ending fair value of plan assets 3.5 3.7
Coal Lease [Member]    
Changes in Plan Assets:    
Beginning fair value of plan assets [1] 3.7  
Ending fair value of plan assets [1] 3.5 3.7
Coal Lease [Member] | Fair Value, Inputs, Level 3 [Member]    
Changes in Plan Assets:    
Beginning fair value of plan assets 3.7 [1] 4.0
Change in fair value of plan assets (0.2) (0.3)
Ending fair value of plan assets [1] $ 3.5 $ 3.7
[1] The Company’s interest represents approximately 26% of the lease which is currently between American Premier Underwriters (APU), the Lessor and CONSOL Energy (CONSOL), the Lessee. The lease pertains to real property mined by CONSOL located in Pennsylvania.