Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Millions	Mar. 31, 2021	Dec. 31, 2020
Allowances for accounts receivable	$ 16.8	$ 16.5
Company common shares shares authorized (in shares)	200,000,000	200,000,000
Common shares, shares issued (in shares)	76,729,850	75,834,668
Treasury shares (in shares)	746,378	158,836
Preferred Class A
Preferred stock, shares authorized (Class I & Class II Preferred stock) (in shares)	10,000,000	10,000,000
Preferred Class B
Preferred stock, shares authorized (Class I & Class II Preferred stock) (in shares)	10,000,000	10,000,000