Statements of Unaudited Condensed Consolidated Changes in Equity Statement - USD ($) $ in Millions	Total	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Treasury Stock [Member]	AOCI Attributable to Parent [Member]	Noncontrolling Interest [Member]
Balance, beginning of period (in shares) at Dec. 31, 2018		292,600,000
Balance, beginning of period at Dec. 31, 2018	$ 424.2	$ 37.7	$ 3,916.7	$ (3,060.2)	$ (186.1)	$ (283.9)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Comprehensive Income (Loss), Net of Tax, Attributable to Parent	(13.7)			(22.1)		8.4
Shares Issued, Shares, Share-based Payment Arrangement, after Forfeiture		1,700,000
Shares Issued, Value, Share-based Payment Arrangement, after Forfeiture	$ (10.0)		(56.5)		46.5
Stock Repurchased During Period, Shares	(11,500,000)	(11,500,000)
Common Share Repurchases, Value	$ (124.3)				(124.3)
Dividends, Common Stock	(14.5)			(14.5)
Balance, end of period (in shares) at Mar. 31, 2019		282,800,000
Balance, end of period at Mar. 31, 2019	$ 261.7	$ 37.7	3,860.2	(3,096.8)	(263.9)	(275.5)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common Stock, Dividends, Per Share, Declared	$ 0.05
Balance, beginning of period (in shares) at Dec. 31, 2019	270,084,005	270,100,000
Balance, beginning of period at Dec. 31, 2019	$ 357.9	$ 37.7	3,872.1	(2,842.4)	(390.7)	(318.8)	$ 0.0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Comprehensive Income (Loss), Net of Tax, Attributable to Parent	(46.9)			(52.1)		1.7	3.5
Shares Issued, Shares, Share-based Payment Arrangement, after Forfeiture		1,700,000
Shares Issued, Value, Share-based Payment Arrangement, after Forfeiture	2.1		(23.6)		25.7
Stock Issued During Period, Shares, Acquisitions		126,800,000
Noncontrolling Interest, Increase from Business Combination							329.8
Stock Issued During Period, Value, Acquisitions	947.4	$ 15.9	601.7
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders	(5.5)						(5.5)
Dividends, Common Stock	$ (24.0)			(24.0)
Balance, end of period (in shares) at Mar. 31, 2020	398,587,083	398,600,000
Balance, end of period at Mar. 31, 2020	$ 1,231.0	$ 53.6	$ 4,450.2	$ (2,918.5)	$ (365.0)	$ (317.1)	$ 327.8
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common Stock, Dividends, Per Share, Declared	$ 0.06