Condensed Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Millions	Jun. 30, 2022	Dec. 31, 2021	Jun. 30, 2021
Statement of Financial Position [Abstract]
Accounts receivable, allowances	$ (18.2)	$ (16.1)	$ (19.7)
Convertible preferred stock, par value (us dollar per share)	$ 0.01	$ 0.01	$ 0.01
Convertible preferred stock. aggregate liquidation preference	$ 400.0	$ 400.0	$ 400.0
Convertible preferred stock, shares authorized ( in shares)	400,000	400,000	400,000
Convertible preferred stock, shares issued ( in shares)	400,000	400,000	400,000
Convertible preferred stock, shares outstanding ( in shares)	400,000	400,000	400,000
Common stock (voting), par value (in usd per share)	$ 0.01	$ 0.01	$ 0.01
Common stock (voting), shares authorized ( in shares)	100,000,000.0	100,000,000.0	100,000,000.0
Common Stock (voting), issued ( in shares)	65,000,000.0	70,400,000	70,000,000.0
Common Stock (voting), outstanding ( in shares)	65,000,000.0	70,400,000	70,000,000.0
Undesignated Preferred Stock, shares authorized ( in shares)	5,000,000.0	5,000,000.0	5,000,000.0
Undesignated Preferred Stock, issued ( in shares)	0	0	0
Undesignated Preferred Stock, outstanding ( in shares)	0	0	0

Amount of allowance for credit loss on accounts receivable, classified as current.

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The aggregate liquidation preference (or restrictions) of stock classified as temporary equity that has a preference in involuntary liquidation considerably in excess of the par or stated value of the shares. The liquidation preference is the difference between the preference in liquidation and the par or stated values of the share. Temporary equity is a security with redemption features that are outside the control of the issuer, is not classified as an asset or liability in conformity with GAAP, and is not mandatorily redeemable. Includes any type of security that is redeemable at a fixed or determinable price or on a fixed or determinable date or dates, is redeemable at the option of the holder, or has conditions for redemption which are not solely within the control of the issuer. If convertible, the issuer does not control the actions or events necessary to issue the maximum number of shares that could be required to be delivered under the conversion option if the holder exercises the option to convert the stock to another class of equity. If the security is a warrant or a rights issue, the warrant or rights issue is considered to be temporary equity if the issuer cannot demonstrate that it would be able to deliver upon the exercise of the option by the holder in all cases. Includes stock with put option held by ESOP and stock redeemable by holder only in the event of a change in control of the issuer.

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