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Consolidated Statements of Cash Flows (Parenthetical) - USD ($) shares in Millions, $ in Millions | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Dec. 31, 2014 | Mar. 31, 2015 | Mar. 31, 2014 | Dec. 31, 2014
Statement Of Cash Flows [Abstract] |  |  |  |
Interest payments related to settlement of agreement |  |  |  | $ 416.6
Tax refund related to settlement agreement payment |  | $ 235.2 | $ (929.7) |
Excess tax benefits from settlement agreement | $ 37.7 |  |  | $ (37.7)
Common stock shares issued in connection with settlement agreement | 18 |  |  |

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- Definition Excess tax benefit from settlement agreement out-of-period adjustment. + References No definition available. + Details
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- Definition Increase (decrease) in income taxes refund related to settlement agreement payment. + References No definition available. + Details
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- Definition Payments of interest on settlement agreement. + References No definition available. + Details
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