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Fair Value Measurements (Changes in the Balances of Level 3 Financial Liabilities) (Details) - Jun. 30, 2015 - Embedded contractual derivative liability [Member] - USD ($)
$ in Millions
Total
Total
Changes in Level 3 Financial Liabilities    
Opening balance $ 3.3 $ 2.6
Transfers Into Level 3 0.0 0.0
Transfers out of Level 3 0.0 0.0
Realized in net income 6.5 7.2
Unrealized in accumulated other comprehensive income 0.0 0.0
Purchases, issues, sales and settlements:    
Purchases 0.0 0.0
Issues 0.0 0.0
Sales 0.0 0.0
Settlements 0.0 0.0
Closing balance $ 9.8 $ 9.8