Comprehensive Income - Schedule of Components of Accumulated Other Comprehensive Income (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2015
Total
Components of Accumulated other comprehensive income, net of taxes
Balance at the beginning of the period (in dollars)	$ 15.9
Other comprehensive income (loss) before reclassifications	(49.1)
Amounts reclassified from other comprehensive income	0.4
Net other comprehensive income (loss)	(48.7)
Balance at the end of the period (in dollars)	(32.8)
Foreign Currency Translation Adjustment
Components of Accumulated other comprehensive income, net of taxes
Balance at the beginning of the period (in dollars)	(5.4)
Other comprehensive income (loss) before reclassifications	(60.1)
Amounts reclassified from other comprehensive income	0
Net other comprehensive income (loss)	(60.1)
Balance at the end of the period (in dollars)	(65.5)
Realized and Unrealized Losses on Derivative Securities
Components of Accumulated other comprehensive income, net of taxes
Balance at the beginning of the period (in dollars)	(1.6)
Other comprehensive income (loss) before reclassifications	2.4
Amounts reclassified from other comprehensive income	0.3
Net other comprehensive income (loss)	2.7
Balance at the end of the period (in dollars)	1.1
Unrealized Gain (Loss) on Investment Securities
Components of Accumulated other comprehensive income, net of taxes
Balance at the beginning of the period (in dollars)	22.9
Other comprehensive income (loss) before reclassifications	8.6
Amounts reclassified from other comprehensive income	0.1
Net other comprehensive income (loss)	8.7
Balance at the end of the period (in dollars)	$ 31.6