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Fair Value Measurements Unobservable Inputs Rollforward (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended |  |
--- | --- | --- | ---
Jun. 30, 2013 | Jun. 30, 2012 | Dec. 31, 2012 | Dec. 31, 2011
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Contingent Consideration | $ 24.3 |  |  |
The amount of total losses for the period included in net loss attributable to the fair value of changes in assets still held | 0 | 0 |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Beginning balance |  |  | 2.0 | 0.7
Total realized/unrealized gains (losses) Included in other comprehensive income | 2.0 | 0.3 |  |
Ending balance | $ 4.0 | $ 1.0 | $ 2.0 | $ 0.7

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