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Equity (Tables)

6 Months Ended

Jun. 30, 2018

Equity

Schedule of common stock and additional paid-in capital activity

	Three Months Ended								Six Months Ended
	June 30, 2018								June 30, 2018
						Weighted Average								Weighted Average
	Shares		Amount			Exercise Price			Shares		Amount			Exercise Price
	(in millions, except share and per share amounts)
Stock-based compensation(1)	15,574		$	12.9					285,007		$	13.9
Stock options exercised	—			—					48,275			2.8		$	57.91
Share repurchases	—			—					(592,564)			(50.0)
Total	15,574		$	12.9					(259,282)		$	(33.3)

⁽¹⁾ The six months ended June 30, 2018 amount is comprised of stock-based compensation expense of $19.3 million reduced by $5.4 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, 2018		924,575		$	74.09
Granted(1)		474,715			84.26
Vested		(3,362)			71.72
Cancelled or forfeited		(13,318)			74.93
Unvested at June 30, 2018		1,382,610		$	77.58
Shares reserved for future grants (all plans)		1,368,824

⁽¹⁾ 474,715 RSUs, including 178,970 performance-based RSUs, were granted in March 2018.

Schedule of accumulated other comprehensive loss

				Pension and			Accumulated
	Foreign Currency			Postretirement			Other
	Translation			Benefit Adjustments,			Comprehensive
	Loss			Net of Tax			Loss
	(in millions)
Balance as of January 1, 2018	$	(51.1)		$	(20.5)		$	(71.6)
Current-period change		(14.1)			—			(14.1)
Balance as of June 30, 2018	$	(65.2)		$	(20.5)		$	(85.7)

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