Equity (Tables)

9 Months Ended

Sep. 30, 2017

Equity

Schedule of common stock and additional paid-in capital activity

	Three Months Ended					Nine Months Ended
	September 30, 2017					September 30, 2017
				Weighted Average					Weighted Average
	Shares	Amount		Exercise Price		Shares	Amount		Exercise Price
	(in millions, except share and per share amounts)
Stock-based compensation(1)	2,133	$	8.4			164,435	$	22.5
Stock options exercised	9,925		0.5	$	55.73	66,455		3.4	$	50.81
Total	12,058	$	8.9			230,890	$	25.9

⁽¹⁾ The nine months ended September 30, 2017 amount is comprised of stock-based compensation expense of $23.3 million reduced by $0.8 million of payments we made to tax authorities on our employees’ behalf for shares withheld related to net share settlements.

Summary of the status of the Company's unvested restricted stock units and changes during the year

		Weighted
		Average Grant
Unvested Shares	Shares	Date Fair Value
Unvested at January 1, 2017	985,540	$	64.34
Granted(1)	446,525		79.60
Vested	(8,159)		62.49
Cancelled	(38,274)		67.84
Unvested at September 30, 2017	1,385,632	$	69.18
Shares reserved for future grants (all plans)	1,650,458

⁽¹⁾ 446,525 RSUs, including 169,009 performance-based RSUs.

Schedule of accumulated other comprehensive loss

			Pension and		Accumulated
	Foreign Currency		Postretirement		Other
	Translation		Benefit Adjustments,		Comprehensive
	(Loss) Gain		Net of Tax		(Loss) Income
	(in millions)
Balance as of January 1, 2017	$	(79.9)	$	(24.8)	$	(104.7)
Current-period change		24.5		2.3		26.8
Balance as of September 30, 2017	$	(55.4)	$	(22.5)	$	(77.9)