Consolidated Statements of Cash Flows - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income (loss)	$ 389.8	$ 149.8	$ (88.1)
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:
Depreciation and amortization	123.3	112.8	101.9
Equity in income (loss) of unconsolidated affiliates, including dividends	(0.8)	1.5	(3.7)
Other operating credits and charges, net	8.0	17.4	16.3
(Gain) loss on sale or impairment of long-lived assets, net	6.8	(8.4)	2.1
Loss on early debt extinguishment	0.0	17.3	0.0
Stock-based compensation related to stock plans	9.7	13.0	9.3
Exchange (gain) loss on remeasurement	2.1	(2.0)	2.8
Cash settlements of warranty, net of accruals	(6.8)	(13.6)	(8.5)
Pension expense (payments), net of contributions	(1.8)	3.7	6.0
Non-cash interest expense, net	0.4	3.8	0.8
Other adjustments, net	0.1	(1.1)	1.2
(Increase) decrease in receivables	(35.0)	(8.9)	10.6
(Increase) decrease in inventories	(22.7)	(11.0)	3.5
(Increase) decrease in prepaid expenses	(1.6)	1.0	2.2
Increase (decrease) in accounts payable and accrued liabilities	22.5	53.8	(20.3)
Increase (decrease) in deferred income taxes	(20.3)	13.2	(6.9)
Net cash provided by operating activities	473.7	342.3	29.2
CASH FLOWS FROM INVESTING ACTIVITIES:
Property, plant, and equipment additions	(148.6)	(124.8)	(113.8)
Proceeds from asset sales	3.2	0.3	0.5
Payments to Acquire Businesses, Net of Cash Acquired	(20.8)	0.0	0.0
Investment in and refunds from joint ventures	0.0	0.0	1.1
Receipt of proceeds from notes receivable from asset sales	0.0	410.0	0.0
Payment of long-term deposit	(32.0)	0.0	0.0
(Increase) decrease in restricted cash under letters of credit	0.0	1.2	(3.9)
Other investing activities, net	(0.4)	(0.4)	0.2
Net cash provided by (used in) investing activities	(198.6)	286.3	(115.9)
CASH FLOWS FROM FINANCING ACTIVITIES:
Borrowings of long-term debt	0.0	350.0	0.0
Repayment of long term debt	(2.6)	(742.5)	(2.3)
Payment of debt issuance fees	(0.5)	(5.2)	0.0
Taxes paid related to net share settlement of equity awards	(5.9)	(9.2)	(6.1)
Sale of common stock, net of cash payments under equity plans	(0.4)	(0.1)	0.7
Other financing activities, net	0.0	0.0	3.3
Net cash used in financing activities	(9.4)	(407.0)	(4.4)
Effect of exchange rate on cash and cash equivalents	3.0	3.0	(6.9)
Net increase (decrease) in cash and cash equivalents	268.7	224.6	(98.0)
Cash and cash equivalents at beginning of year	659.3	434.7	532.7
Cash and cash equivalents at end of year	$ 928.0	$ 659.3	$ 434.7