Segment Reporting Total Assets (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Segment Reporting
Total assets	$ 13,996.3	$ 15,580.1
Canada
Segment Reporting
Total assets	5,537.2	6,103.2
U.S.
Segment Reporting
Total assets	2,388.6	2,506.5
Europe
Segment Reporting
Total assets	5,773.3	6,547.7
MCI
Segment Reporting
Total assets	75.2	83.3
Corporate
Segment Reporting
Total assets	$ 222.0	$ 339.4