Condensed Consolidated Statements of Stockholders' (Deficit) Equity (Parenthetical) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
	Jul. 13, 2018	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Jan. 01, 2018	Dec. 31, 2017
Statement of Stockholders' Equity [Abstract]
Dividends per share common stock (in dollars per share)	$ 0.16	$ 160,000.00	$ 160,000.00	$ 0.48	$ 0.48
Reduction to retained earnings		$ (1,646.7)		$ (1,646.7)			$ (1,735.2)
ASU 2016-16
Reduction to retained earnings						$ 1.0
ASU 2014-09
Reduction to retained earnings						$ (2.4)