Financial Statements for Guarantors of the Senior Notes (Details 2) - USD ($) $ in Millions	Dec. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Dec. 31, 2014	Dec. 31, 2013
Assets:
Cash and cash equivalents	$ 563.4	$ 786.0	$ 786.0	$ 887.9	$ 428.5
Short-term marketable securities	234.7	84.9
Receivables, net of allowance	378.7	369.9
Income tax receivable	102.1	94.9
Inventory	665.8	943.1
Property, plant, and equipment, net	5,966.8	5,348.0
Investments in and advances to subsidiaries	0.0	0.0
Restricted cash	178.2	195.8
Goodwill and other assets	1,035.6	1,063.3
Total assets	9,125.3	8,885.9		8,695.3
Liabilities:
Accounts payable	156.1	216.8
Accrued liabilities	426.1	529.6
Total debt	3,056.6	3,195.4
Deferred income	23.5	27.1
Deferred income taxes	1,072.9	752.2
Advances from subsidiaries	0.0	0.0
Other liabilities	79.0	116.1
Total stockholders' equity	4,311.1	4,048.7		3,397.4	2,749.1
Total liabilities and stockholders' equity	9,125.3	8,885.9
Reportable legal entities | Parent
Assets:
Cash and cash equivalents	537.9	768.3	768.3	827.7	409.7
Short-term marketable securities	234.7	84.9
Receivables, net of allowance	1.1	0.1
Income tax receivable	99.9	94.9
Inventory	0.0	0.0
Property, plant, and equipment, net	48.8	37.7
Investments in and advances to subsidiaries	4,862.4	6,262.9
Restricted cash	0.0	0.0
Goodwill and other assets	150.8	178.8
Total assets	5,935.6	7,427.6
Liabilities:
Accounts payable	5.7	9.9
Accrued liabilities	200.0	224.9
Total debt	818.7	800.6
Deferred income	0.0	0.0
Deferred income taxes	78.6	31.2
Advances from subsidiaries	458.2	2,212.2
Other liabilities	63.3	100.1
Total stockholders' equity	4,311.1	4,048.7
Total liabilities and stockholders' equity	5,935.6	7,427.6
Reportable legal entities | Combined Guarantor Subsidiaries
Assets:
Cash and cash equivalents	5.2	1.7	1.7	11.1	2.1
Short-term marketable securities	0.0	0.0
Receivables, net of allowance	201.1	196.3
Income tax receivable	0.0	0.0
Inventory	409.2	634.1
Property, plant, and equipment, net	2,329.6	1,597.0
Investments in and advances to subsidiaries	2,441.1	3,633.1
Restricted cash	0.0	0.2
Goodwill and other assets	584.9	579.8
Total assets	5,971.1	6,642.2
Liabilities:
Accounts payable	45.2	62.9
Accrued liabilities	84.2	137.3
Total debt	32.0	35.6
Deferred income	21.9	25.4
Deferred income taxes	984.9	711.3
Advances from subsidiaries	11.5	0.0
Other liabilities	13.5	13.6
Total stockholders' equity	4,777.9	5,656.1
Total liabilities and stockholders' equity	5,971.1	6,642.2
Reportable legal entities | Combined Non-Guarantor Subsidiaries
Assets:
Cash and cash equivalents	51.3	51.1	51.1	89.4	44.1
Short-term marketable securities	0.0	0.0
Receivables, net of allowance	176.5	173.5
Income tax receivable	2.2	0.0
Inventory	266.5	325.4
Property, plant, and equipment, net	4,047.6	4,204.3
Investments in and advances to subsidiaries	470.0	908.5
Restricted cash	147.1	160.5
Goodwill and other assets	301.2	304.7
Total assets	5,462.4	6,128.0
Liabilities:
Accounts payable	105.7	144.3
Accrued liabilities	143.2	168.5
Total debt	2,205.9	2,359.2
Deferred income	1.6	1.7
Deferred income taxes	9.1	9.4
Advances from subsidiaries	0.0	0.0
Other liabilities	2.2	2.4
Total stockholders' equity	2,994.7	3,442.5
Total liabilities and stockholders' equity	5,462.4	6,128.0
Eliminations
Assets:
Cash and cash equivalents	(31.0)	(35.1)	$ (35.1)	$ (40.3)	$ (27.4)
Short-term marketable securities	0.0	0.0
Receivables, net of allowance	0.0	0.0
Income tax receivable	0.0	0.0
Inventory	(9.9)	(16.4)
Property, plant, and equipment, net	(459.2)	(491.0)
Investments in and advances to subsidiaries	(7,773.5)	(10,804.5)
Restricted cash	31.1	35.1
Goodwill and other assets	(1.3)	0.0
Total assets	(8,243.8)	(11,311.9)
Liabilities:
Accounts payable	(0.5)	(0.3)
Accrued liabilities	(1.3)	(1.1)
Total debt	0.0	0.0
Deferred income	0.0	0.0
Deferred income taxes	0.3	0.3
Advances from subsidiaries	(469.7)	(2,212.2)
Other liabilities	0.0	0.0
Total stockholders' equity	(7,772.6)	(9,098.6)
Total liabilities and stockholders' equity	$ (8,243.8)	$ (11,311.9)