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Contingencies - Rollforward of Contingency Reserves Related to Environmental Matters (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Accrual for Environmental Loss Contingencies [Roll Forward]    
Beginning balance $ 0.8 $ 1.3
Expenses 0.0 0.0
Payments (0.2) (0.5)
Ending balance $ 0.6 $ 0.8