Accumulated Other Comprehensive Income (Details) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Changes In Accumulated Other Comprehensive Income [Roll Forward]
Pension and postretirement plans, Beginning balance				$ 44.4
Amounts reclassified from accumulated other comprehensive income, net of tax				(1.3)
Pension and postretirement plans, Ending balance		$ 43.1		43.1
Amortization of defined benefit pension items reclassified to net periodic pension cost:
Actuarial gain (loss)	[1]	(0.8)	$ 1.2	(0.8)	$ 1.2
Net loss	[1]	2.5	0.3	3.6	2.2
Prior service credit	[1]	(0.3)	(0.3)	(0.6)	(0.6)
Total before income tax		1.4	1.2	2.2	2.8
Income taxes		(0.6)	(0.4)	(0.9)	(1.1)
Other Comprehensive Income		$ 0.8	$ 0.8	$ 1.3	$ 1.7

[1] These accumulated other comprehensive income components are included in the computation of net periodic pension cost (see Note 9 for additional details).