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Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Statement of Comprehensive Income [Abstract]
Net income	$ 164.4	$ 120.1
Other comprehensive income (loss), net of tax:
Unrealized gain (loss) on securities, net of tax	0.6	(0.3)
Other comprehensive income (loss)	0.6	(0.3)
Comprehensive income	$ 165.0	$ 119.8

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Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income, attributable to parent entity. Excludes changes in equity resulting from investments by owners and distributions to owners.

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