Postretirement Benefit Plans - Change in Plan Assets and Benefit Obligations in AOCL (Details) - Postretirement Benefit Plans [Member] - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Changes in plan assets and benefit obligations recognized in AOCL:
AOCL at beginning of year	$ 21.5	$ 13.3
Net actuarial loss	(0.7)	(14.3)
Recognized net actuarial loss	(0.1)	0.0
Recognized prior service credit	(0.8)	(1.0)
Spinoff of TimkenSteel	0.0	(5.1)
Total recognized in accumulated other comprehensive loss at December 31	$ 21.3	$ 21.5