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Special Charges (Narrative)(Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Actuarial (gain) loss from remeasurement, net |  |  |  |  |  |  |  |  | $ (1.4) | $ 29.6 |
Termination benefit costs |  |  | $ 0.1 |  |  | $ 8.7 |  |  | 0.4 |  |
Other restructuring costs |  |  |  |  |  |  |  |  | 1.0 |  |
DOE Share of Paducah Termination Benefit Costs |  |  |  |  |  |  |  |  |  | 0.4 |
Payments for Restructuring |  |  |  |  |  |  |  |  | (3.6) | (6.9) |
Restructuring Reserve | $ 5.5 |  |  |  | $ 8.7 |  |  |  | 5.5 | 8.7 | $ 2.4
Restructuring Reserve, Noncurrent | 2.1 |  |  |  |  |  |  |  | 2.1 |  |
Restructuring Charges | 0.2 | $ 0.6 | $ 0.6 | $ 0.0 | (0.1) | $ 9.8 | $ 2.9 | $ 0.6 | 1.4 | 13.2 |
Contract Termination [Member] |  |  |  |  |  |  |  |  |  |  |
Termination benefit costs |  |  |  |  |  |  |  |  | 0.1 | 8.7 |
Payments for Restructuring |  |  |  |  |  |  |  |  | (3.1) | (0.3) |
Restructuring Reserve | 5.4 |  |  |  | 8.4 |  |  |  | 5.4 | 8.4 |
Other Restructuring [Member] |  |  |  |  |  |  |  |  |  |  |
Termination benefit costs |  |  |  |  |  |  |  |  | 0.3 | 4.5 |
Payments for Restructuring |  |  |  |  |  |  |  |  | (0.5) | (6.6) |
Restructuring Reserve | $ 0.1 |  |  |  | $ 0.3 |  |  |  | $ 0.1 | $ 0.3 | $ 2.4

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