Segment Information (Details 1) (USD $) In Millions, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2011 BusinessSegment	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2010	Sep. 30, 2010	Jun. 30, 2010	Mar. 31, 2010	Dec. 31, 2011 BusinessSegment	Dec. 31, 2010	Dec. 31, 2009
Externally reported revenues and operating profit for our Mexico operations
Revenue External									$ 3,075.1	$ 2,155.5	$ 2,420.9
Total operating profit	139.0	105.4	95.4	85.5	81.0	91.9	78.9	52.0	425.3	303.8	(30.9)
Total assets and long-lived assets for our Mexico operations
Total assets	6,121.0				5,760.0				6,121.0	5,760.0	4,656.4
Segment Information (Textual) [Abstract]
Number of principal business segments of Company	5								5
Period for revenue recognition									one year or less
MEXICO [Member]
Externally reported revenues and operating profit for our Mexico operations
Revenue External									123.0	98.3	86.8
Total operating profit									18.4	3.4	15.2
Total assets and long-lived assets for our Mexico operations
Total assets	240.4				288.8				240.4	288.8
Long-Lived Assets	$ 143.2				$ 151.7				$ 143.2	$ 151.7