Stock-Based Compensation (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares available for issuance under the 2016 Plan (in shares)	4,693,250
Stock options, granted (in shares)	418,528
Stock options, weighted average exercise price (in dollars per share)	$ 83.47
Stock options, weighted average grant date fair value (in dollars per share)	$ 17.94
Risk-free interest rate (in hundredths)	2.05%
Expected life (in years)	5 years 11 months
Stock volatility (in hundredths)	19.90%
Dividend yield (in hundredths)	0.70%
Stock-based compensation expense	$ 3.5	$ 4.6
Performance Share Unit [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares)	86,597
Grant date fair value (in dollars per share)	$ 83.47
Number of shares of common stock per PSU award (in shares)	1
Performance period	3 years
PSU payout, Minimum (in hundredths)	0.00%
PSU payout, Maximum (in hundredths)	200.00%