Net Loss Per Share and Shareholders' Equity - Reconciliation of Numerator and Denominator of the Basic and Diluted Net Loss Per Share (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Numerator:
Net loss applicable to common shareholders	$ 9.8	$ (15.9)
Denominator:
Denominator for basic EPS–weighted-average common shares (in shares)	67,179,348	52,288,757
Dilutive effect of stock-based compensation arrangements (in shares)	2,496,120	0
Denominator for diluted EPS–adjusted weighted-average common shares (in shares)	69,675,468	52,288,757
Basic EPS (in dollars per share)	$ 0.15	$ (0.30)
Diluted EPS (in dollars per share)	$ 0.14	$ (0.30)