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Lease Obligations (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Lease Obligation [Abstract]
2013	$ 17,309
2014	9,474
2015	5,353
2016	2,261
2017	1,519
Thereafter	1,695
Total	37,611
Rental expense for operating leases	$ 27.7	$ 25.8	$ 28.8

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