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Stock Option Plan - Summary of Option Activity (Detail) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Shares
Outstanding at January 1 (in shares)	860,274	748,208	753,625
Granted (in shares)	226,500	225,000	200,000
Exercised (in shares)	(246,894)	(112,934)	(167,917)
Expired/Forfeited (in shares)	(6,250)	0	(37,500)
Outstanding December 31 (in shares)	833,630	860,274	748,208
Options exercisable (in shares)	375,255	435,899	380,708
Weighted Average Exercise Price
Outstanding at January 1 (in usd per share)	$ 46.58	$ 44.79	$ 42.55
Granted (in usd per share)	57.74	51.07	47.03
Exercised (in usd per share)	45.59	43.67	37.71
Expired/Forfeited (in usd per share)	45.31	0.00	43.56
Outstanding December 31 (in usd per share)	49.92	46.58	44.79
Exercisable at December 31 (in usd per share)	$ 46.68	$ 45.33	$ 44.85
Intrinsic value of options exercised	$ 3.4	$ 1.5	$ 2.0
Intrinsic value of options outstanding	13.9
Intrinsic value of options exercisable	$ 7.5
Closing price (in usd per share)	$ 66.61
Weighted average remaining life of options exercisable	6 years 4 months 15 days
Weighted average remaining life of options outstanding	7 years 5 months 29 days

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- Definition

The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

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Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.

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For presentations that combine terminations, the number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan or that expired.

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Weighted average price of options that were either forfeited or expired.

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Gross number of share options (or share units) granted during the period.

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Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

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Number of options outstanding, including both vested and non-vested options.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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Number of share options (or share units) exercised during the current period.

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