Financial Statements for Guarantors of the Senior Notes (Details 2) - USD ($) $ in Millions	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Assets:
Cash and cash equivalents	$ 786.0	$ 887.9	$ 428.5	$ 573.0
Short-term marketable securities	84.9	75.0
Receivables, net of allowance	369.9	405.3
Income tax receivable	94.9	58.6
Inventory	943.1	1,068.4
Property, plant, and equipment, net	5,348.0	4,902.9
Investments in and advances to subsidiaries	0.0	0.0
Restricted cash	195.8	234.7
Goodwill and other assets	1,063.3	1,062.5
Total assets	8,885.9	8,695.3	7,274.5
Liabilities:
Accounts payable	216.8	295.4
Accrued liabilities	529.6	709.6
Total debt	3,195.4	3,514.5
Deferred income	27.1	36.4
Deferred income taxes	752.2	632.6
Advances from subsidiaries	0.0	0.0
Other liabilities	116.1	109.4
Total stockholders' equity	4,048.7	3,397.4	2,749.1	2,137.6
Total liabilities and stockholders' equity	8,885.9	8,695.3
Reportable legal entities | Parent
Assets:
Cash and cash equivalents	768.3	827.7	409.7	506.2
Short-term marketable securities	84.9	75.0
Receivables, net of allowance	0.1	0.0
Income tax receivable	94.9	58.6
Inventory	0.0	0.0
Property, plant, and equipment, net	37.7	29.3
Investments in and advances to subsidiaries	6,262.9	4,431.1
Restricted cash	0.0	0.0
Goodwill and other assets	178.8	175.1
Total assets	7,427.6	5,596.8
Liabilities:
Accounts payable	9.9	15.0
Accrued liabilities	224.9	235.8
Total debt	800.6	784.0
Deferred income	0.0	0.0
Deferred income taxes	31.2	0.0
Advances from subsidiaries	2,212.2	1,072.0
Other liabilities	100.1	92.6
Total stockholders' equity	4,048.7	3,397.4
Total liabilities and stockholders' equity	7,427.6	5,596.8
Reportable legal entities | Combined Guarantor Subsidiaries
Assets:
Cash and cash equivalents	1.7	11.1	2.1	4.4
Short-term marketable securities	0.0	0.0
Receivables, net of allowance	196.3	187.5
Income tax receivable	0.0	0.0
Inventory	634.1	801.9
Property, plant, and equipment, net	1,597.0	813.6
Investments in and advances to subsidiaries	3,633.1	2,610.6
Restricted cash	0.2	0.0
Goodwill and other assets	579.8	575.3
Total assets	6,642.2	5,000.0
Liabilities:
Accounts payable	62.9	155.5
Accrued liabilities	137.3	280.3
Total debt	35.6	38.9
Deferred income	25.4	34.5
Deferred income taxes	711.3	634.1
Advances from subsidiaries	0.0	0.0
Other liabilities	13.6	13.0
Total stockholders' equity	5,656.1	3,843.7
Total liabilities and stockholders' equity	6,642.2	5,000.0
Reportable legal entities | Combined Non-Guarantor Subsidiaries
Assets:
Cash and cash equivalents	51.1	89.4	44.1	74.8
Short-term marketable securities	0.0	0.0
Receivables, net of allowance	173.5	218.2
Income tax receivable	0.0	0.0
Inventory	325.4	284.6
Property, plant, and equipment, net	4,204.3	4,624.3
Investments in and advances to subsidiaries	908.5	526.4
Restricted cash	160.5	194.4
Goodwill and other assets	304.7	342.3
Total assets	6,128.0	6,279.6
Liabilities:
Accounts payable	144.3	125.5
Accrued liabilities	168.5	193.5
Total debt	2,359.2	2,691.6
Deferred income	1.7	1.9
Deferred income taxes	9.4	12.1
Advances from subsidiaries	0.0	0.0
Other liabilities	2.4	3.8
Total stockholders' equity	3,442.5	3,251.2
Total liabilities and stockholders' equity	6,128.0	6,279.6
Eliminations
Assets:
Cash and cash equivalents	(35.1)	(40.3)	$ (27.4)	$ (12.4)
Short-term marketable securities	0.0	0.0
Receivables, net of allowance	0.0	(0.4)
Income tax receivable	0.0	0.0
Inventory	(16.4)	(18.1)
Property, plant, and equipment, net	(491.0)	(564.3)
Investments in and advances to subsidiaries	(10,804.5)	(7,568.1)
Restricted cash	35.1	40.3
Goodwill and other assets	0.0	(30.2)
Total assets	(11,311.9)	(8,181.1)
Liabilities:
Accounts payable	(0.3)	(0.6)
Accrued liabilities	(1.1)	0.0
Total debt	0.0	0.0
Deferred income	0.0	0.0
Deferred income taxes	0.3	(13.6)
Advances from subsidiaries	(2,212.2)	(1,072.0)
Other liabilities	0.0	0.0
Total stockholders' equity	(9,098.6)	(7,094.9)
Total liabilities and stockholders' equity	$ (11,311.9)	$ (8,181.1)