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Property and equipment, net (Details 1) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2012 | Jun. 30, 2011 | Jun. 30, 2012 | Jun. 30, 2011
Interest cost capitalized and depreciation and amortization expense for property and equipment |  |  |  |
Interest cost capitalized | $ 1.2 | $ 0.8 | $ 2.2 | $ 1.7
Depreciation and amortization expense for property and equipment | $ 42.5 | $ 34.4 | $ 90.6 | $ 67.9

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