(Parenthetical) (USD $) In Millions, except Per Share data, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Statement of Financial Position [Abstract]
Allowance for doubtful accounts	$ 64.9
Preferred stock, no par value	$ 0.00	$ 0.00
Preferred stock, shares authorized	20.0	20.0
Preferred stock, shares issued	0	0.2
Preferred stock, shares outstanding	0	0
Common stock, par value	$ 0.10	$ 0.10
Common stock, shares authorized	800.0	800.0
Common stock, shares issued	532.3	492.0
Common stock, shares outstanding	424.5	417.5
Treasury stock, shares	107.8	74.6