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Fair Value Measurements (Changes in Level 3 Financial Liabilities) (Details) - Embedded Contractual Derivative [Member] - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Beginning balance $ 2.6 $ 0.0
Transfers into Level 3 0.0 0.0
Transfers out of Level 3 0.0 0.0
Realized in net income 8.9 2.6
Unrealized in accumulated other comprehensive income 0.0 0.0
Purchases 0.0 0.0
Issues 0.0 0.0
Sales 0.0 0.0
Settlements 0.0 0.0
Ending balance $ 11.5 $ 2.6