Consolidated Balance Sheets (Parenthetical) - USD ($) shares in Millions, $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Consolidated Balance Sheets (Parenthetical) [Abstract]
Allowance for doubtful accounts	$ 21.5	$ 26.8
Accumulated depreciation	1,142.8	1,185.0
Intangible assets, accumulated amortization	$ 759.2	$ 737.4
Preferred stock, par value	$ 1.00	$ 1.00
Preferred stock, shares authorized	7.5	7.5
Preferred stock, shares issued	0.0	0.0
Common stock, par value	$ 0.15	$ 0.15
Common stock, shares authorized	1,000.0	1,000.0
Common stock, shares issued	297.2	297.2
Common stock, shares outstanding	217.1	223.9
Treasury stock, shares	80.1	73.3