Income Taxes - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016
Income Tax Disclosure [Abstract]
Provision for income taxes	$ 13.6	$ 16.1	$ 44.3	$ 67.5
Tax benefit from the release of reserves for uncertain tax positions and a valuation allowance in a foreign jurisdiction	$ 4.2	$ 6.6	$ 9.1
Effective tax rate (as a percent)	16.50%		24.20%		30.50%