Earnings per Common Share (Tables)

12 Months Ended

Dec. 31, 2018

Earnings Per Share [Abstract]

Computation of Basic and Diluted Earnings per Share

The following table sets forth the computation of basic and diluted earnings per common share:

Year Ended December 31,	2018		2017		2016
Net income, basic and diluted	$	160.2	$	106.5	$	95.7
Weighted average common shares outstanding for basic earnings per share computation	57,778,857		51,429,366		44,511,774
Dilutive effects of stock-based compensation	438,266		473,843		398,622
Weighted average common shares outstanding for diluted earnings per common share computation	58,217,123		51,903,209		44,910,396
Basic earnings per common share	$	2.77	$	2.07	$	2.15
Diluted earnings per common share	2.75		2.05		2.13