Supplemental Cash Flow Information Cash Paid (Details) - USD ($) $ in Millions	12 Months Ended
	Jan. 31, 2017	Jan. 31, 2016	Jan. 31, 2015
Supplemental Cash Flow Information [Abstract]
Interest, net of interest capitalization	$ 40.6	$ 42.5	$ 59.7
Income Taxes	$ 213.9	$ 237.5	$ 133.4