Supplemental Cash Flow Data (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014
Change in Operating Capital [Abstract]
(Increase) decrease in accounts receivable	$ (127.2)	$ 175.0
(Increase) decrease in work in process and other current assets	(433.6)	(215.8)
Increase (decrease) in accounts payable	(1.5)	(400.5)
Increase (decrease) in customer advances and other current liabilities	(176.8)	(389.1)
Change in other assets and liabilities, net	(69.7)	(116.5)
Change in operating capital	(808.8)	(946.9)
Income taxes paid	330.3	345.5
Interest paid	$ 92.8	$ 100.5