Segment Reporting Total Assets (Details) - USD ($) shares in Millions, $ in Millions		6 Months Ended
	Feb. 03, 2016	Jun. 30, 2016	Jun. 30, 2017	Dec. 31, 2016
Segment Reporting Information [Line Items]
Total assets			$ 30,118.6	$ 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
UNITED STATES
Segment Reporting Information [Line Items]
Total assets			19,936.1	19,844.7
Canada [Member]
Segment Reporting Information [Line Items]
Total assets			4,388.7	4,206.8
Europe [Member]
Segment Reporting Information [Line Items]
Total assets			5,191.7	4,673.7
International [Member]
Segment Reporting Information [Line Items]
Total assets			317.0	302.8
Corporate [Member]
Segment Reporting Information [Line Items]
Total assets			$ 285.1	$ 313.5