Quarterly report pursuant to Section 13 or 15(d)

Non-Cash Activities (Details)

v2.4.0.6
Non-Cash Activities (Details) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2012
Mar. 31, 2011
Non Cash Activities [Line Items]    
Expenditures Included In Construction Trade Payables $ 15.7 $ 31.0