CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME
Net income	$ 278.0	$ 963.1	$ 788.7
Other comprehensive income:
Unrealized gain (loss) on securities available-for-sale	15.5	(3.1)	(7.3)
Tax benefit (expense)	(2.3)	1.1	0.2
Unrealized gain (loss) on securities available-for-sale, net of tax	13.2	(2.0)	(7.1)
Unrealized gain (loss) on cash flow hedges	0.1	(0.1)	(0.7)
Tax benefit			0.2
Unrealized gain (loss) on cash flow hedges, net of tax	0.1	(0.1)	(0.5)
Unrealized gain (loss) on net investment hedge	6.5	39.1	(72.3)
Tax benefit (expense)	(1.6)	(9.5)	26.2
Unrealized gain (loss) on net investment hedge, net of tax	4.9	29.6	(46.1)
Foreign currency translation adjustments (inclusive of deconsolidation of $26.8 million related to sale of business for the year ended December 31, 2019)	20.0	(25.4)	64.2
Other comprehensive income, net of tax	38.2	2.1	10.5
Total comprehensive income, net of tax	$ 316.2	$ 965.2	$ 799.2