Financial Statements for Guarantors of the Senior Notes - Balance Sheet (Details) - USD ($) $ in Millions	Mar. 31, 2018		Dec. 31, 2017
Assets:
Cash and cash equivalents	$ 625.4	[1]	$ 778.6
Short-term marketable securities	220.8	[1]	319.5
Receivables, net of allowance	342.5	[1]	369.7
Income tax receivable	30.6	[1]	29.0
Inventory	599.4	[1]	640.6
Property, plant, and equipment, net	6,393.5	[1]	6,134.7
Investments in and advances to subsidiaries	0.0		0.0
Restricted cash	177.3	[1]	195.2
Goodwill and other assets	1,087.5		1,075.9
Total assets	9,477.0	[1]	9,543.2
Liabilities:
Accounts payable	183.4	[1]	175.4
Accrued liabilities	396.4	[1]	440.0
Debt	3,223.4	[1]	3,242.4
Deferred income	19.8	[1]	20.5
Deferred income taxes	757.0	[1]	743.2
Advances from subsidiaries	0.0		0.0
Other liabilities	66.4	[1]	63.7
Total stockholders' equity	4,830.6	[1]	4,858.0
Total liabilities and stockholders' equity	9,477.0	[1]	9,543.2
Reportable legal entities | Parent
Assets:
Cash and cash equivalents	607.7		763.9
Short-term marketable securities	220.8		319.5
Receivables, net of allowance	2.0		1.1
Income tax receivable	25.7		24.0
Inventory	0.0		0.0
Property, plant, and equipment, net	46.8		47.6
Investments in and advances to subsidiaries	5,613.8		5,515.2
Restricted cash	0.0		0.0
Goodwill and other assets	162.5		159.2
Total assets	6,679.3		6,830.5
Liabilities:
Accounts payable	10.0		7.5
Accrued liabilities	214.0		236.5
Debt	843.2		838.1
Deferred income	0.0		0.0
Deferred income taxes	48.2		53.8
Advances from subsidiaries	669.1		775.2
Other liabilities	64.2		61.4
Total stockholders' equity	4,830.6		4,858.0
Total liabilities and stockholders' equity	6,679.3		6,830.5
Reportable legal entities | Combined Guarantor Subsidiaries
Assets:
Cash and cash equivalents	7.6		1.6
Short-term marketable securities	0.0		0.0
Receivables, net of allowance	167.2		204.2
Income tax receivable	0.0		0.0
Inventory	371.8		413.6
Property, plant, and equipment, net	2,549.9		2,310.7
Investments in and advances to subsidiaries	2,905.8		3,049.7
Restricted cash	0.0		0.0
Goodwill and other assets	592.4		590.9
Total assets	6,594.7		6,570.7
Liabilities:
Accounts payable	57.5		65.9
Accrued liabilities	51.3		59.1
Debt	27.4		28.3
Deferred income	18.5		19.1
Deferred income taxes	700.9		683.2
Advances from subsidiaries	0.0		0.0
Other liabilities	0.7		0.7
Total stockholders' equity	5,738.4		5,714.4
Total liabilities and stockholders' equity	6,594.7		6,570.7
Reportable legal entities | Combined Non-Guarantor Subsidiaries
Assets:
Cash and cash equivalents	53.3		65.3
Short-term marketable securities	0.0		0.0
Receivables, net of allowance	173.3		164.4
Income tax receivable	4.9		5.0
Inventory	238.2		236.8
Property, plant, and equipment, net	4,312.2		4,293.0
Investments in and advances to subsidiaries	325.9		255.5
Restricted cash	134.1		143.0
Goodwill and other assets	335.1		326.3
Total assets	5,577.0		5,489.3
Liabilities:
Accounts payable	116.0		102.2
Accrued liabilities	133.6		144.9
Debt	2,352.8		2,376.0
Deferred income	1.3		1.4
Deferred income taxes	13.7		5.9
Advances from subsidiaries	0.0		0.0
Other liabilities	1.5		1.6
Total stockholders' equity	2,958.1		2,857.3
Total liabilities and stockholders' equity	5,577.0		5,489.3
Eliminations
Assets:
Cash and cash equivalents	(43.2)		(52.2)
Short-term marketable securities	0.0		0.0
Receivables, net of allowance	0.0		0.0
Income tax receivable	0.0		0.0
Inventory	(10.6)		(9.8)
Property, plant, and equipment, net	(515.4)		(516.6)
Investments in and advances to subsidiaries	(8,845.5)		(8,820.4)
Restricted cash	43.2		52.2
Goodwill and other assets	(2.5)		(0.5)
Total assets	(9,374.0)		(9,347.3)
Liabilities:
Accounts payable	(0.1)		(0.2)
Accrued liabilities	(2.5)		(0.5)
Debt	0.0		0.0
Deferred income	0.0		0.0
Deferred income taxes	(5.8)		0.3
Advances from subsidiaries	(669.1)		(775.2)
Other liabilities	0.0		0.0
Total stockholders' equity	(8,696.5)		(8,571.7)
Total liabilities and stockholders' equity	$ (9,374.0)		$ (9,347.3)

[1] (unaudited)