Segment Reporting Total Assets (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Segment Reporting Information [Line Items]
Total assets	$ 12,951.7	$ 13,996.3
Canada [Member]
Segment Reporting Information [Line Items]
Total assets	5,025.2	5,537.2
U.S. [Member]
Segment Reporting Information [Line Items]
Total assets	2,499.1	2,388.6
Europe [Member]
Segment Reporting Information [Line Items]
Total assets	5,028.7	5,773.3
MCI [Member]
Segment Reporting Information [Line Items]
Total assets	68.9	75.2
Corporate [Member]
Segment Reporting Information [Line Items]
Total assets	$ 329.8	$ 222.0