Income Taxes (Details 3) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Reconciliation of the beginning and ending of unrecognized tax benefits
Balance at January 1	$ 114.2	$ 66.8	$ 32.4
Additions based on tax positions related to the current period	5.3	0.5	5.7
Additions for tax positions of prior periods	17.2	58.7	7.3
Reductions for tax positions of prior periods	(10.3)	(13.6)	(21.8)
Statute expirations	(0.1)	(2.9)	(1.4)
Settlements	3.6	4.7	44.6
Balance at December 31	$ 129.9	$ 114.2	$ 66.8