Income Taxes (Tables)

3 Months Ended

Mar. 31, 2018

Income Tax Disclosure [Abstract]

Schedule of Effective Income Tax Rate Reconciliation

The reconciliation of income taxes for the three months ended March 31, 2018 and 2017, computed at the U.S. federal statutory income tax rate, compared to our effective income tax rate, was as follows:

	Three Months Ended March 31,
(in millions of dollars)	2018			2017
Income tax expense computed at U.S. statutory income tax rate (21% and 35%, respectively)	$	1.3		$	—
Interest on Brazilian Tax Assessment	0.3			0.7
Partial release of reserve for the Brazilian Tax Assessment	(5.6		)	—
Excess tax benefit from stock-based compensation	(2.5		)	(5.3		)
Net operating losses not benefited	1.0			0.4
Miscellaneous	1.2			0.7
Income tax benefit as reported	$	(4.3	)	$	(3.5	)
Effective tax rate	NM			NM