Segment Reporting Total Assets (Details) - USD ($) $ in Millions	Sep. 30, 2015	Dec. 31, 2014
Segment Reporting Information [Line Items]
Total assets	$ 12,645.3	$ 13,980.1
Canada [Member]
Segment Reporting Information [Line Items]
Total assets	4,766.9	5,537.2
U.S. [Member]
Segment Reporting Information [Line Items]
Total assets	2,440.7	2,388.6
Europe [Member]
Segment Reporting Information [Line Items]
Total assets	5,060.5	5,773.3
MCI [Member]
Segment Reporting Information [Line Items]
Total assets	133.4	75.2
Corporate [Member]
Segment Reporting Information [Line Items]
Total assets	$ 243.8	$ 205.8