Consolidated Balance Sheets (unaudited) (Parenthetical) - USD ($) $ in Millions	Mar. 31, 2017	Dec. 31, 2016
Assets
Trade receivables, allowances	$ 43.7	$ 37.1
Property and equipment, accumulated depreciation	518.6	488.0
Identified intangibles, with finite useful lives, accumulated amortization	129.5	180.6
Investments, Fair Value Disclosure	$ 214.0	$ 212.7
Company shareholders' equity
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	100,000,000	100,000,000
Common Stock, Shares, Issued	45,286,447	45,213,832
Common stock, shares outstanding (in shares)	45,286,447	45,213,832
Long-Term Senior Notes [Member]
Line of Credit Facility [Line Items]
Unamortized Debt Issuance Expense	$ 2.2	$ 2.3
Line of Credit [Member]
Line of Credit Facility [Line Items]
Unamortized Debt Issuance Expense	$ 18.5	$ 19.6