CONSOLIDATED STATEMENTS OF EQUITY/ AND REDEEMABLE NONCONTROLLING INTEREST Consolidated Statements of Equity/ and Redeemable Noncontrolling Interest (parenthetical) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Consolidated Statements Of Equity deficit And Redeemable Noncontrolling Interest Parenthetical [Abstract]
Adjustments to Additional Paid in Capital, Income Tax Benefit from Share-based Compensation	$ 0.1	$ 5.5	$ 9.0
Common Stock, Dividends, Per Share, Declared	$ 1.65	$ 1.65	$ 1.50