Financial Statements for Guarantors of the Senior Notes - Balance Sheet (Details) - USD ($) $ in Millions	Sep. 30, 2018		Dec. 31, 2017
Assets:
Cash and cash equivalents	$ 427.4	[1]	$ 778.6
Short-term marketable securities	0.0	[1]	319.5
Receivables, net of allowance	396.2	[1]	369.7
Income tax receivable	46.3	[1]	29.0
Inventory	707.0	[1]	640.6
Property, plant, and equipment, net	6,538.0	[1]	6,134.7
Investments in and advances to subsidiaries	0.0		0.0
Restricted cash	138.5	[1]	195.2
Goodwill and other assets	1,151.6		1,075.9
Total assets	9,405.0	[1]	9,543.2
Liabilities:
Accounts payable	219.5	[1]	175.4
Accrued liabilities	411.0	[1]	440.0
Debt	3,275.7	[1]	3,242.4
Deferred income	18.4	[1]	20.5
Deferred income taxes	755.9	[1]	743.2
Advances from subsidiaries	0.0		0.0
Other liabilities	85.1	[1]	63.7
Total stockholders' equity	4,639.4	[1]	4,858.0
Total liabilities and stockholders' equity	9,405.0	[1]	9,543.2
Reportable legal entities | Parent
Assets:
Cash and cash equivalents	333.0		763.9
Short-term marketable securities	0.0		319.5
Receivables, net of allowance	0.0		1.1
Income tax receivable	41.4		24.0
Inventory	0.0		0.0
Property, plant, and equipment, net	52.9		47.6
Investments in and advances to subsidiaries	5,806.5		5,515.2
Restricted cash	0.0		0.0
Goodwill and other assets	208.9		159.2
Total assets	6,442.7		6,830.5
Liabilities:
Accounts payable	15.0		7.5
Accrued liabilities	216.7		236.5
Debt	397.3		838.1
Deferred income	0.0		0.0
Deferred income taxes	0.0		53.8
Advances from subsidiaries	1,104.5		775.2
Other liabilities	69.8		61.4
Total stockholders' equity	4,639.4		4,858.0
Total liabilities and stockholders' equity	6,442.7		6,830.5
Reportable legal entities | Combined Guarantor Subsidiaries
Assets:
Cash and cash equivalents	70.2		1.6
Short-term marketable securities	0.0		0.0
Receivables, net of allowance	201.1		204.2
Income tax receivable	0.0		0.0
Inventory	459.0		413.6
Property, plant, and equipment, net	2,081.8		2,310.7
Investments in and advances to subsidiaries	3,373.4		3,049.7
Restricted cash	0.0		0.0
Goodwill and other assets	590.2		590.9
Total assets	6,775.7		6,570.7
Liabilities:
Accounts payable	93.6		65.9
Accrued liabilities	55.7		59.1
Debt	26.5		28.3
Deferred income	17.2		19.1
Deferred income taxes	738.9		683.2
Advances from subsidiaries	0.0		0.0
Other liabilities	0.6		0.7
Total stockholders' equity	5,843.2		5,714.4
Total liabilities and stockholders' equity	6,775.7		6,570.7
Reportable legal entities | Combined Non-Guarantor Subsidiaries
Assets:
Cash and cash equivalents	51.8		65.3
Short-term marketable securities	0.0		0.0
Receivables, net of allowance	196.4		164.4
Income tax receivable	4.9		5.0
Inventory	258.3		236.8
Property, plant, and equipment, net	4,990.5		4,293.0
Investments in and advances to subsidiaries	341.3		255.5
Restricted cash	110.9		143.0
Goodwill and other assets	356.7		326.3
Total assets	6,310.8		5,489.3
Liabilities:
Accounts payable	112.2		102.2
Accrued liabilities	138.6		144.9
Debt	2,851.9		2,376.0
Deferred income	1.2		1.4
Deferred income taxes	34.7		5.9
Advances from subsidiaries	0.0		0.0
Other liabilities	14.7		1.6
Total stockholders' equity	3,157.5		2,857.3
Total liabilities and stockholders' equity	6,310.8		5,489.3
Eliminations
Assets:
Cash and cash equivalents	(27.6)		(52.2)
Short-term marketable securities	0.0		0.0
Receivables, net of allowance	(1.3)		0.0
Income tax receivable	0.0		0.0
Inventory	(10.3)		(9.8)
Property, plant, and equipment, net	(587.2)		(516.6)
Investments in and advances to subsidiaries	(9,521.2)		(8,820.4)
Restricted cash	27.6		52.2
Goodwill and other assets	(4.2)		(0.5)
Total assets	(10,124.2)		(9,347.3)
Liabilities:
Accounts payable	(1.3)		(0.2)
Accrued liabilities	0.0		(0.5)
Debt	0.0		0.0
Deferred income	0.0		0.0
Deferred income taxes	(17.7)		0.3
Advances from subsidiaries	(1,104.5)		(775.2)
Other liabilities	0.0		0.0
Total stockholders' equity	(9,000.7)		(8,571.7)
Total liabilities and stockholders' equity	$ (10,124.2)		$ (9,347.3)

[1] (unaudited)