Statement of Consolidated Cash Flows $ in Millions	12 Months Ended
	Dec. 31, 2018 USD ($)		Dec. 31, 2017 USD ($)		Dec. 31, 2016 USD ($)
Cash flows from operating activities:
Net income	$ 91.7		$ 45.4		$ 91.7
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation of property, plant and equipment	42.1		38.3		34.5
Amortization of definite-lived intangible assets	1.8		1.4		1.5
Amortization of debt discount and debt issuance costs	1.0		1.2		1.1
Deferred income taxes	36.7		89.0		57.4
Non-cash equity compensation	10.3		13.3		11.8
Lower of cost or market inventory write-down	0.0		0.0		4.9
Non-cash asset impairment charges	1.4		19.2		2.8
Loss on repurchase of Senior Notes	0.0		0.0		11.1
(Gain) loss on disposition of property, plant and equipment	(0.2)		(0.5)		0.2
Gain on disposition of available for sale securities	(2.9)		(2.3)		0.0
Non-cash defined benefit net periodic benefit cost (income)	6.6		4.8		3.7
Other non-cash changes in assets and liabilities	(21.9)		15.5		17.5
Changes in operating assets and liabilities:
Trade and other receivables	(22.3)		(30.9)		(26.8)
Contract assets	0.7		0.0		0.0
Inventories, excluding lower of cost or market write-down	(45.0)		(6.3)		13.1
Prepaid expenses and other current assets	(0.4)		(1.7)		(8.0)
Accounts payable	29.2		13.0		3.4
Accrued liabilities	(2.6)		(4.7)		26.2
Annual variable cash contributions to VEBAs	(15.7)		(20.0)		(19.5)
Long-term assets and liabilities, net	(4.1)		(2.2)		(26.0)
Net cash provided by operating activities1	150.2	[1]	141.5	[1]	165.6	[1]
Cash flows from investing activities:
Capital expenditures	(74.1)		(75.5)		(76.1)
Purchase of available for sale securities	(135.2)		(247.5)		(255.3)
Payments to Acquire Available-for-sale Securities, Equity	(0.9)		0.0		0.0
Proceeds from disposition of available for sale securities	283.9		296.9		55.0
Cash payment for acquisition of Imperial Machine & Tool Co., net of cash received	(43.2)		0.0		0.0
Proceeds from disposal of property, plant and equipment	0.6		0.6		0.0
Net cash provided by (used in) investing activities	31.1	[2]	(25.5)	[2]	(276.4)	[2]
Cash flows from financing activities:
Repayment of principal and redemption premium of 8.25% Senior Notes	0.0		0.0		(206.0)
Issuance of 5.875% Senior Notes	0.0		0.0		375.0
Cash paid for debt issuance costs	0.0		0.0		6.8
Proceeds from stock option exercises	0.0		0.0		1.2
Repayment of capital lease	(0.7)		(0.4)		0.0
Cancellation of shares to cover employees' tax withholdings upon vesting of non-vested shares	(6.9)		(4.5)		(2.9)
Repurchase of common stock	(60.7)		(79.5)		(33.3)
Cash dividends and dividend equivalents paid	(37.7)		(35.0)		(32.4)
Net cash (used in) provided by financing activities	(106.0)	[2]	(119.4)	[2]	94.8	[2]
Net increase (decrease) in cash, cash equivalents and restricted cash during the period	75.3		(3.4)		(16.0)
Cash, cash equivalents and restricted cash at end of period	125.6		51.1		55.2
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	$ 139.6		$ 64.3		$ 67.7

[1] See Note 11 for adjustments made to arrive at our Consolidated Balance Sheet as of January 1, 2018 upon adopting ASC 606 (as defined in Note 1).

[2] See Note 15 for supplemental disclosure on non-cash transactions.