Asset Acquisition (Details) (USD $) In Millions | 1 Months Ended | |||
|---|---|---|---|---|
Jun. 30, 2011 | Feb. 28, 2011 | Nov. 30, 2010 | Oct. 31, 2010 | |
| Significant Acquisitions | ||||
| Asset Acquisition, Purchase Price | $ 49.2 | |||
| Asset Acquisition, Cash Payments | 8.0 | 41.1 | ||
| Asset Acquisition, Purchase Price Adjustment | 0.5 | |||
| Asset Acquisition, Acquired Property and Equipment, Amount | 35.6 | |||
| Asset Acquisition, Acquired Intangible Assets, Amount | $ 13.6 | |||