Consolidated and Combined Balance Sheets (Parenthetical) (Parentheticals) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Statement of Financial Position [Abstract]
Allowance for Doubtful Accounts Receivable, Current	$ 44.1	$ 47.8
Preferred stock authorized (in dollars per shares)	$ 0.01	$ 0.01
Preferred stock authorized (in shares)	15,000,000	15,000,000
Preferred stock issued (in shares)	0	0
Preferred stock outstanding (in shares)	0	0
Common stock authorized (in dollars per shares)	$ 0.01	$ 0.01
Common stock authorized (in shares)	2,000,000,000.0	2,000,000,000
Common Stock, Shares, Issued	348,200,000	346,000,000
Common stock outstanding (in shares)	347,800,000	345,900,000