Income Taxes (Tables)

9 Months Ended

Sep. 30, 2018

Income Tax Disclosure [Abstract]

Schedule of Provision for Income Taxes and Effective Income Tax Rates

The following table presents the provision for income taxes and the effective income tax rates for the three and nine months ended September 30, 2018 and 2017:

	Three Months Ended September 30,
	2018			2017			$ Change		% Change
	(in millions, except percentages)
Earnings before income taxes	$	67.7		$	7.4		$	60.3		814.9	%
Income tax expense		19.7			2.1			17.6		838.1	%
Effective income tax rate		29.1	%		28.4	%
	Nine Months Ended September 30,
	2018			2017			$ Change		% Change
	(in millions, except percentages)
Earnings before income taxes	$	106.1		$	55.4		$	50.7		91.5	%
Income tax expense		31.5			22.0			9.5		43.2	%
Effective income tax rate		29.7	%		39.7	%