Shareholders' Equity - Treasury Stock (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended	5 Months Ended
	Mar. 31, 2017	Mar. 31, 2017	Nov. 14, 2016	May 02, 2012
Equity [Abstract]
Number of shares authorized to be repurchased (in shares)			500,000.0	500,000
Number shares repurchased (in shares)		24,086
Payments for repurchase of common stock		$ 0.2
Remaining number of shares authorized to be repurchased (in shares)	475,914	475,914
Average price per share of treasury stock acquired and held (in dollars per share)	$ 39.71
Movement in Treasury Stock [Roll Forward]
Beginning balance (in shares)	744,091
Restricted stock grants (in shares)	(48,000)
Forfeitures and other (in shares)	561
Ending balance (in shares)	696,652	696,652