CONSOLIDATED BALANCE SHEETS (PARENTHETICAL) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Allowance for doubtful accounts	$ 19.0	$ 18.1
Allowance for doubtful accounts	2.5	2.4
Allowance for obsolete inventories	25.8	22.0
Accumulated depreciation	3,507.2	3,416.4
Accumulated amortization	1,406.3	1,206.5
Due to Affiliate, Current	$ 4.1	$ 0.5
Preferred stock, par value (in dollars per share)	$ 0.01	$ 0.01
Preferred stock, shares authorized (in shares)	25,000,000.0	25,000,000.0
Preferred stock, shares issued (in shares)	0	0
Treasury stock, shares (in shares)	9,500,000	9,500,000
Common Class A
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	500,000,000.0	500,000,000.0
Common stock, shares issued (in shares)	2,600,000	2,600,000
Common stock, shares outstanding (in shares)	2,600,000	2,600,000
Common Class B
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	500,000,000.0	500,000,000.0
Common stock, shares issued (in shares)	210,100,000	209,800,000
Class A exchangeable shares
Exchangeable stock, shares issued (in shares)	2,700,000	2,700,000
Exchangeable stock, shares outstanding (in shares)	2,700,000	2,700,000
Class B exchangeable shares
Exchangeable stock, shares issued (in shares)	11,100,000	11,100,000
Exchangeable stock, shares outstanding (in shares)	11,100,000	11,100,000