Background and Basis of Presentation (Details) $ / shares in Units, $ in Millions				9 Months Ended
	Jul. 29, 2015 USD ($) $ / shares shares	Jun. 30, 2015 USD ($) $ / shares shares	Jun. 12, 2015	Sep. 30, 2016 USD ($)	Sep. 30, 2015 USD ($)
Noncontrolling Interest [Line Items]
Stock split conversion ratio			106.3
Proceeds from initial public offering, net of underwriting discounts and commissions, and estimated offering expenses		$ 265.0
Proceeds from Exercise by Underwriters	$ 7.8			$ 0.0	$ 294.0
IPO [Member]
Noncontrolling Interest [Line Items]
Shares sold, initial public offering (in shares) | shares	415,600	14,285,714
Shares sold, initial public offering, price per share (in dollars per share) | $ / shares	$ 20.00	$ 20.00