Subsequent Events - Narrative (Details) - USD ($) $ / shares in Units, $ in Millions		3 Months Ended			6 Months Ended
	Jul. 29, 2016	Jun. 30, 2016	Jun. 30, 2015	[1]	Jun. 30, 2016	Jun. 30, 2015	[1]	Jul. 21, 2016	Jun. 20, 2016
Subsequent Event [Line Items]
Dividends declared per share (in dollars per share)		$ 0.11	$ 0.11		$ 0.22	$ 0.22
Subsequent Event
Subsequent Event [Line Items]
Date of announcement of dividend	Jul. 29, 2016
Dividends declared per share (in dollars per share)	$ 0.11
Date of payment of dividend	Aug. 26, 2016
Date of record of dividend	Aug. 12, 2016
OMHHF
Subsequent Event [Line Items]
Disposal group, including discontinued operation, consideration									$ 45.0
OMHHF | Subsequent Event
Subsequent Event [Line Items]
Disposal group, including discontinued operation, consideration								$ 3.7

[1] Amounts have been recast to reflect discontinued operations. See Note 3 for details.