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Quarterly Financial Data (Unaudited) Quarterly Financial Data (Unaudited) - Narrative (Details) (USD $)
In Millions, unless otherwise specified |
3 Months Ended | 12 Months Ended | ||
|---|---|---|---|---|
|
Sep. 30, 2014
|
Mar. 31, 2014
|
Mar. 31, 2013
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Dec. 31, 2012
|
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| Asset Impairment Charges | $ 47.9 | $ 38.2 | $ 85.3 | $ 22.8 |