Segment Reporting Net Sales (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Segment Reporting
Net sales	$ 2,294.0	$ 947.6	$ 986.2	$ 657.2	$ 844.4	$ 1,017.4	$ 1,005.7	$ 700.0	$ 4,885.0	$ 3,567.5	$ 4,146.3
Maximum Percentage of Sales Accounted for by Single Customer									10.00%
Unaffiliated Customers
Segment Reporting
Net sales									$ 4,885.0	3,567.5	4,146.3
Canada
Segment Reporting
Net sales									1,425.7	1,511.5	1,793.9
Canada | Unaffiliated Customers
Segment Reporting
Net sales									1,344.4	1,421.1	1,699.9
United States and Territories [Member] | Unaffiliated Customers
Segment Reporting
Net sales									1,622.4	94.1	98.1
United Kingdom | Unaffiliated Customers
Segment Reporting
Net sales									1,071.4	1,224.6	1,391.5
Other foreign countries | Unaffiliated Customers
Segment Reporting
Net sales									$ 846.8	$ 827.7	$ 956.8