Consolidated Balance Sheets (Parenthetical) - $ / shares shares in Millions		Mar. 31, 2016	Dec. 31, 2015
Consolidated Balance Sheets
Preferred stock, par value (in dollars per share)	[1]	$ 1.00	$ 1.00
Preferred stock, shares authorized	[1]	0.1	0.1
Preferred stock, shares issued	[1]	0.0	0.0
Common stock, par value (in dollars per share)	[1]	$ 0.01	$ 0.01
Common stock, shares authorized	[1]	100.0	100.0
Common stock, shares issued	[1]	70.9	70.8
Common stock, shares outstanding	[1]	70.9	70.8

[1] Amounts may not add due to rounding