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Pension and Postretirement Health and Life Benefits (Schedule of Net Benefit Costs) (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Actuarial (gain) from remeasurement $ (3.9)   $ (3.9)  
Pension Plan, Defined Benefit [Member] | Successor [Member]        
Service costs 1.0   2.0  
Interest costs 9.3   18.6  
Expected return on plan assets (gains) (12.2)   (24.4)  
Amortization of actuarial (gains) losses, net 0.0   0.0  
Actuarial (gain) from remeasurement (3.9)   (3.9)  
Net periodic benefit cost (credit) (5.8)   (7.7)  
Pension Plan, Defined Benefit [Member] | Predecessor [Member]        
Service costs   $ 0.6   $ 1.2
Interest costs   10.6   21.1
Expected return on plan assets (gains)   (12.8)   (25.6)
Amortization of actuarial (gains) losses, net   (0.3)   (0.6)
Actuarial (gain) from remeasurement   0.0   0.0
Net periodic benefit cost (credit)   (1.3)   (2.7)
Postretirement Health and Life Benefits Plans [Member] | Successor [Member]        
Service costs 0.0   0.1  
Interest costs 2.2   4.4  
Expected return on plan assets (gains) (0.3)   (0.5)  
Amortization of prior service costs (credits), net 0.0   (0.1)  
Net periodic benefit cost (credit) $ 1.9   $ 3.9  
Postretirement Health and Life Benefits Plans [Member] | Predecessor [Member]        
Service costs   0.4   0.9
Interest costs   2.5   5.0
Expected return on plan assets (gains)   (0.5)   (1.0)
Amortization of prior service costs (credits), net   (0.1)   (0.2)
Net periodic benefit cost (credit)   $ 2.3   $ 4.7