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Quarterly report pursuant to Section 13 or 15(d)

Lease Obligations (Narrative) (Details)

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Lease Obligations (Narrative) (Details) (USD $)
In Millions
3 Months Ended 6 Months Ended
Jun. 30, 2011
Jun. 30, 2010
Jun. 30, 2011
Jun. 30, 2010
Lease Obligations Ìý Ìý Ìý Ìý
Operating lease expense $ 7.9 $ 6.0 $ 13.7 $ 11.9