Financial Statements for Guarantors of the Senior Notes - Balance Sheet (Details) - USD ($) $ in Millions	Sep. 30, 2017		Dec. 31, 2016	Sep. 30, 2016	Dec. 31, 2015
Assets:
Cash and cash equivalents	$ 874.7	[1]	$ 563.4	$ 557.8	$ 786.0
Short-term marketable securities	150.0	[1]	234.7
Receivables, net of allowance	399.1	[1]	378.7
Income tax receivable	181.2	[1]	102.1
Inventory	661.8	[1]	665.8
Property, plant, and equipment, net	6,070.1	[1]	5,966.8
Investments in and advances to subsidiaries	0.0		0.0
Restricted cash	176.3	[1]	178.2
Goodwill and other assets	1,051.7		1,035.6
Total assets	9,564.9	[1]	9,125.3
Liabilities:
Accounts payable	194.5	[1]	156.1
Accrued liabilities	418.2	[1]	426.1
Debt	3,276.4	[1]	3,056.6
Deferred income	21.3	[1]	23.5
Deferred income taxes	1,247.4	[1]	1,072.9
Advances from subsidiaries	0.0		0.0
Other liabilities	57.0	[1]	79.0
Total stockholders' equity	4,350.1	[1]	4,311.1
Total liabilities and stockholders' equity	9,564.9	[1]	9,125.3
Reportable legal entities | Parent
Assets:
Cash and cash equivalents	853.0		537.9	523.6	768.3
Short-term marketable securities	150.0		234.7
Receivables, net of allowance	0.3		1.1
Income tax receivable	179.0		99.9
Inventory	0.0		0.0
Property, plant, and equipment, net	48.2		48.8
Investments in and advances to subsidiaries	5,145.3		4,862.4
Restricted cash	0.0		0.0
Goodwill and other assets	147.9		150.8
Total assets	6,523.7		5,935.6
Liabilities:
Accounts payable	8.4		5.7
Accrued liabilities	215.7		200.0
Debt	833.1		818.7
Deferred income	0.0		0.0
Deferred income taxes	130.8		78.6
Advances from subsidiaries	932.6		458.2
Other liabilities	53.0		63.3
Total stockholders' equity	4,350.1		4,311.1
Total liabilities and stockholders' equity	6,523.7		5,935.6
Reportable legal entities | Combined Guarantor Subsidiaries
Assets:
Cash and cash equivalents	6.1		5.2	3.9	1.7
Short-term marketable securities	0.0		0.0
Receivables, net of allowance	222.1		219.2
Income tax receivable	0.0		0.0
Inventory	434.4		444.2
Property, plant, and equipment, net	2,222.9		2,347.4
Investments in and advances to subsidiaries	3,057.9		2,565.0
Restricted cash	0.0		0.0
Goodwill and other assets	585.3		585.1
Total assets	6,528.7		6,166.1
Liabilities:
Accounts payable	74.4		54.8
Accrued liabilities	70.0		87.7
Debt	29.3		32.0
Deferred income	19.8		21.9
Deferred income taxes	1,096.5		984.7
Advances from subsidiaries	0.0		0.0
Other liabilities	1.9		13.5
Total stockholders' equity	5,236.8		4,971.5
Total liabilities and stockholders' equity	6,528.7		6,166.1
Reportable legal entities | Combined Non-Guarantor Subsidiaries
Assets:
Cash and cash equivalents	71.5		51.3	64.3	51.1
Short-term marketable securities	0.0		0.0
Receivables, net of allowance	176.7		158.4
Income tax receivable	2.2		2.2
Inventory	237.9		231.5
Property, plant, and equipment, net	4,316.7		4,029.8
Investments in and advances to subsidiaries	386.2		334.6
Restricted cash	120.4		147.1
Goodwill and other assets	325.9		301.0
Total assets	5,637.5		5,255.9
Liabilities:
Accounts payable	112.1		96.1
Accrued liabilities	139.9		139.7
Debt	2,414.0		2,205.9
Deferred income	1.5		1.6
Deferred income taxes	19.8		9.3
Advances from subsidiaries	0.0		0.0
Other liabilities	2.1		2.2
Total stockholders' equity	2,948.1		2,801.1
Total liabilities and stockholders' equity	5,637.5		5,255.9
Eliminations
Assets:
Cash and cash equivalents	(55.9)		(31.0)	$ (34.0)	$ (35.1)
Short-term marketable securities	0.0		0.0
Receivables, net of allowance	0.0		0.0
Income tax receivable	0.0		0.0
Inventory	(10.5)		(9.9)
Property, plant, and equipment, net	(517.7)		(459.2)
Investments in and advances to subsidiaries	(8,589.4)		(7,762.0)
Restricted cash	55.9		31.1
Goodwill and other assets	(7.4)		(1.3)
Total assets	(9,125.0)		(8,232.3)
Liabilities:
Accounts payable	(0.4)		(0.5)
Accrued liabilities	(7.4)		(1.3)
Debt	0.0		0.0
Deferred income	0.0		0.0
Deferred income taxes	0.3		0.3
Advances from subsidiaries	(932.6)		(458.2)
Other liabilities	0.0		0.0
Total stockholders' equity	(8,184.9)		(7,772.6)
Total liabilities and stockholders' equity	$ (9,125.0)		$ (8,232.3)

[1] (unaudited)