Condensed Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Millions	Mar. 31, 2017	Dec. 31, 2016
Accounts receivable, allowances	$ 24.3	$ 26.3
Property and equipment, accumulated depreciation	705.1	589.9
Identifiable intangible assets, accumulated amortization	$ 418.7	$ 377.1
Common stock, par value (in dollars per share)	$ 0.001	$ 0.001
Common stock, shares authorized (in shares)	300,000,000	300,000,000
Common stock, shares issued (in shares)	111,622,997	111,087,027
Common stock, shares outstanding (in shares)	111,622,997	111,087,027
Series A Preferred Stock
Preferred stock, par value (in dollars per share)	$ 0.001	$ 0.001
Preferred stock, shares authorized (in shares)	10,000,000	10,000,000
Preferred stock, shares issued (in shares)	71,510	72,235
Preferred stock, shares outstanding (in shares)	71,510	72,235