Income Taxes (Deferred Tax Assets and Liabilities) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Deferred tax assets
Net operating loss carryforwards	$ 20.7	$ 21.1
Tax credit carryforwards	36.1	37.0
Restructuring and impairment charges	0.1	0.3
Pension and deferred compensation	51.2	69.8
Other	19.8	15.1
Valuation allowance	(23.5)	(20.4)
Total deferred tax assets	104.4	122.9
Deferred tax liabilities:
Accelerated depreciation	40.5	42.8
Other	5.4	3.9
Total deferred tax liabilities	45.9	46.7
Net deferred tax asset	$ 58.5	$ 76.2