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Fair Value Measurements - Level 3 Inputs (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]    
Fair value at beginning of the period $ 3.0 $ 2.8
Included in earnings (1.3) 4.2
Settlements 0.0 4.8
Transfers in 0.0 0.9
Transfers out 0.1 0.0
Fair value at end of period 1.6 3.0
Gains for the period included in earnings attributable to the change in unrealized gains relating to derivatives still held at the reporting date $ 1.6 $ 2.6
Percent change in non-performance risk fair value input 10.00%