Consolidated Balance Sheets Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017
Statement of Financial Position [Abstract]
Allowance for Sales Discounts, Doubtful Accounts and Cash Discounts, Accounts Receivable, Current	$ 16.0
Allowance for Sales Discounts, Doubtful Accounts, Cash Discounts and Returns, Accounts Receivable, Current		$ 18.1
Amortizable intangible assets, accumulated amortization	236.4	203.7
Debt Issuance cost, unamortized	$ 5.5	$ 7.1
Preferred stock, par value	$ 0.01	$ 0.01
Preferred stock, shares authorized	25,000,000	25,000,000
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	200,000,000	200,000,000
Common stock, shares, issued	106,249,322	109,597,197
Common stock, shares outstanding	102,748,700	106,684,084
Treasury stock, shares	3,500,622	2,913,113