Supplemental Cash Flow Data (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Change in Operating Capital [Abstract]
(Increase) decrease in accounts receivable	$ (376.5)	$ (1,063.6)	$ (227.1)
(Increase) decrease in work in process and other current assets	(89.7)	(74.7)	(14.2)
Increase (decrease) in accounts payable	741.9	1,443.7	231.3
Increase (decrease) in customer advances and other current liabilities	36.3	203.9	(24.0)
Change in other assets and liabilities, net	11.0	48.3	(72.2)
Change in operating capital	323.0	557.6	(106.2)
Income taxes paid	570.4	540.1	610.1
Interest paid	$ 216.7	$ 173.9	$ 188.6
Convertible Notes due July 31, 2032
Change in Operating Capital [Abstract]
Convertible debt, shares issued for conversion premium			1,217,112
Convertible debt, fair value of common stock issued			$ 89.2
Convertible debt, adjustment to additional paid-in capital			$ 32.2