Shareholders' Equity - Share Repurchase and Dividends (Details) - USD ($) $ / shares in Units, $ in Millions						11 Months Ended	12 Months Ended
	Dec. 23, 2016	Sep. 23, 2016	Jun. 24, 2016	Mar. 24, 2016	Feb. 22, 2016	Nov. 30, 2015	Dec. 31, 2016	Dec. 31, 2015
Shareholders' Equity
Repurchases to date (in shares)							10,698,195	4,290,527
Repurchases to date							$ 249.3	$ 90.9
Dividend declared (in dollars per share)					$ 0.04		$ 0.16
Dividend paid	$ 6.4	$ 6.4	$ 6.5	$ 6.5			$ 25.8
Target dividend per annum (in dollars per share)							$ 0.16
Repurchase Program
Shareholders' Equity
Common stock repurchased during the period (in shares)							6,475,480
Aggregate cost of common stock repurchased during the period							$ 160.0
Amount approved for repurchase of common stock							$ 225.0
Repurchases to date (in shares)							9,312,522
Repurchases to date							$ 225.0
Anti-Dilutive Repurchase Program
Shareholders' Equity
Common stock repurchased during the period (in shares)						1,245,000
Aggregate cost of common stock repurchased during the period						$ 24.9