Segment Reporting Total Assets (Details) - USD ($) shares in Millions, $ in Millions		3 Months Ended
	Feb. 03, 2016	Mar. 31, 2016	Mar. 31, 2017	Dec. 31, 2016
Segment Reporting Information [Line Items]
Total assets			$ 29,542.9	$ 29,341.5
Stock Issued During Period, Value, New Issues	$ 2,500.0	$ 2,525.6
Stock Issued During Period, Shares, New Issues	29.9
Canada [Member]
Segment Reporting Information [Line Items]
Total assets			4,256.6	4,206.8
UNITED STATES
Segment Reporting Information [Line Items]
Total assets			19,965.3	19,844.7
Europe [Member]
Segment Reporting Information [Line Items]
Total assets			4,771.1	4,673.7
MCI [Member]
Segment Reporting Information [Line Items]
Total assets			254.6	255.6
Corporate [Member]
Segment Reporting Information [Line Items]
Total assets			$ 295.3	$ 360.7