Supplemental Cash Flow Data (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Changes in Operating Capital [Abstract]
(Increase) decrease in accounts receivable	$ 627.4	$ 544.3
(Increase) decrease in work in process and other current assets	(188.5)	(221.6)
Increase (decrease) in accounts payable	(948.3)	(886.9)
Increase (decrease) in customer advances and other current liabilities	(96.2)	58.9
Change in other assets and liabilities, net	(136.7)	(6.5)
Change in operating capital	(742.3)	(511.8)
Income taxes paid	165.9	108.7
Interest paid	$ 41.6	$ 40.8