XML 31 R104.htm IDEA: XBRL DOCUMENT v2.4.0.6
Supplemental Cash Flow Information - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Supplemental Cash Flow Information [Line Items]      
Cash interest paid, including realized interest rate swap settlements $ 274.2 $ 279.1 $ 271.3
Cash interest paid relating to interest rate swap amendments and terminations 0 149.7 0
Value of shuttle tanker contributed by unrelated party in exchange of equity interest in subsidiary     $ 35.0
Ownership interest     33.00%