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Comprehensive Income - Tax Effects Allocated to Each Component of Other Comprehensive Income (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017		Dec. 31, 2016		Dec. 31, 2015
Accumulated Other Comprehensive Income (Loss)
Pre-Tax	$ 112.3		$ (173.3)		$ (56.1)
Tax Benefit (Expense)	7.2		22.9		(13.1)
Net of Tax	119.5		(150.4)		(69.2)
Foreign currency translation adjustment
Accumulated Other Comprehensive Income (Loss)
Pre-Tax	128.0		(115.3)		(93.2)
Tax Benefit (Expense)	0.0		0.0		0.0
Net of Tax	128.0		(115.3)		(93.2)
Change in net realized and unrealized gain (loss) on derivative securities
Accumulated Other Comprehensive Income (Loss)
Pre-Tax	(0.7)		0.3		2.3
Tax Benefit (Expense)	(0.1)		(0.2)		(0.4)
Net of Tax	(0.8)		0.1		1.9
Change in net unrealized gain (loss) on investment securities
Accumulated Other Comprehensive Income (Loss)
Pre-Tax	(15.0)		(58.3)		34.8
Tax Benefit (Expense)	7.3		23.1		(12.7)
Net of Tax	$ (7.7)	[1]	$ (35.2)	[1]	$ 22.1
[1] See Note 2 for amounts reclassified from Other comprehensive income (loss).

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Amount before tax, after reclassification adjustments of other comprehensive income (loss).

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Amount after tax and reclassification adjustments of other comprehensive income (loss).

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