Shareholders' Equity and Noncontrolling Interests, Stock Repurchase (Details) - USD ($) $ in Millions		1 Months Ended	3 Months Ended
	Apr. 24, 2018	Apr. 21, 2020	Mar. 31, 2020	Mar. 31, 2019
Shareholders' Equity
Treasury stock retired (in dollars)			$ 0.0	$ 0.0
Payments for shares repurchased (in dollars)			$ 257.2	$ 160.0
2018 Stock Repurchase Program
Shareholders' Equity
Value of shares authorized to be repurchased (in dollars)	$ 2,000.0
Repurchase of stock program, period	3 years
Number of shares repurchased			2,700,000	1,800,000
Payments for shares repurchased (in dollars)			$ 257.2	$ 160.0
Number of treasury shares retired				800,000
Treasury stock retired (in dollars)				$ 72.4
Number of shares repurchased and retained in treasury				1,000,000.0
Payments for shares repurchased (in dollars)				$ 87.6
Subsequent Event | 2018 Stock Repurchase Program
Shareholders' Equity
Number of shares repurchased and retained in treasury		0
Value of shares remaining that may be repurchased under the stock repurchase program (in dollars)		$ 587.9