Condensed Consolidated Statements of Cash Flows - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015
Operating activities
Net income	$ 132.1	$ 111.8
Adjustments to reconcile net income to net cash provided by operating activities
Depreciation and amortization	100.5	100.6
Deferred income taxes	20.9	10.1
Stock-based compensation	10.5	7.7
Pensions and other postretirement benefits, net of contributions	(2.4)	0.2
Loss on disposal of property, plant and equipment, net	1.1	0.8
Changes in operating assets and liabilities
Accounts receivable	(100.6)	(110.7)
Inventories	6.3	8.3
Accounts payable and accrued expenses	74.8	59.9
Deferred revenue	(7.5)	(20.4)
Other assets and liabilities	(52.2)	(14.0)
Net cash provided by operating activities	183.5	154.3
Investing activities
Purchases of property, plant and equipment	(105.7)	(91.4)
Proceeds from sale of property, plant and equipment	0.6	0.1
Proceeds from government grants	2.8	0.0
Final distribution of Reserve Yield Plus Fund	1.0	0.0
Net cash used in investing activities	(101.3)	(91.3)
Financing activities
Payments of long-term debt and capital lease obligations	(3.8)	(17.3)
Proceeds from issuance of long-term debt	29.6	12.9
Purchase of treasury stock	(5.0)	(2.7)
Employee stock option exercises	0.1	0.4
Net cash provided by (used in) financing activities	20.9	(6.7)
Effect of exchange rate changes on cash	2.8	(4.2)
Net increase in cash and cash equivalents	105.9	52.1
Cash and cash equivalents at beginning of period	282.5	249.2
Cash and cash equivalents at end of period	388.4	301.3
Supplemental cash flow information
Interest paid	43.9	47.2
Income taxes paid, net of refunds	$ 38.1	$ 7.9