Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Income Tax Disclosure [Abstract]
Income tax expense	$ 10.7	$ 4.9	$ 14.0	$ 5.8
Pre-tax earnings (loss)	28.0	$ 12.3	$ 38.0	$ 13.8
Effective tax rate (as a percent)			36.90%	42.20%
Recognized excess tax benefit	$ 0.2		$ 0.6
Effective tax rate with local jurisdiction, amount			0.2
Write-off of deferred tax assets related to certain net operating loss carryforwards			$ 0.2