Income Taxes (Deferred Tax Assets and Liabilities) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Operating Loss Carryforwards [Line Items]
Deferred Tax Assets, Operating Loss Carryforwards, Foreign	$ 5.4
Deferred Tax Assets, Operating Loss Carryforwards, State and Local	15.0
Deferred tax assets
Net operating loss carryforwards	20.4	20.7
Tax credit carryforwards	40.4	36.1
Restructuring and impairment charges	0	0.1
Pension and deferred compensation	43.7	51.2
Other	20.0	19.8
Valuation allowance	(22.1)	(23.5)
Total deferred tax assets	102.4	104.4
Deferred tax liabilities:
Accelerated depreciation	36.8	40.5
Other	7.7	5.4
Total deferred tax liabilities	44.5	45.9
Net deferred tax asset	57.9	58.5
State and Local Jurisdiction [Member]
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	267.0
Foreign Tax Authority [Member]
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	22.5
Deferred Tax Assets, Operating Loss Carryforwards, Not Subject to Expiration	17.2
Tax credit carryforwards	22.6
Year 2019 [Member] | Foreign Tax Authority [Member]
Operating Loss Carryforwards [Line Items]
Tax credit carryforwards	3.1
Year 2024 [Domain] | Foreign Tax Authority [Member]
Operating Loss Carryforwards [Line Items]
Tax credit carryforwards	2.1
Year 2015 [Domain] | State and Local Jurisdiction [Member]
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	8.3
Year After 2015 [Domain] | State and Local Jurisdiction [Member]
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	258.7
Year 2016 [Member] [Domain] | Foreign Tax Authority [Member]
Operating Loss Carryforwards [Line Items]
Tax credit carryforwards	0.4
Year 2020 [Member] | State and Local Jurisdiction [Member]
Operating Loss Carryforwards [Line Items]
Tax credit carryforwards	1.5
Year 2020 [Member] | Foreign Tax Authority [Member]
Operating Loss Carryforwards [Line Items]
Tax credit carryforwards	3.2
Year 2021 [Member] | Foreign Tax Authority [Member]
Operating Loss Carryforwards [Line Items]
Tax credit carryforwards	9.6
Year 2017 [Member] | Foreign Tax Authority [Member]
Operating Loss Carryforwards [Line Items]
Tax credit carryforwards	2.4
Year 2018 [Member] | Foreign Tax Authority [Member]
Operating Loss Carryforwards [Line Items]
Tax credit carryforwards	1.8
Research Tax Credit Carryforward [Member] | State and Local Jurisdiction [Member]
Operating Loss Carryforwards [Line Items]
Tax credit carryforwards	3.3
Research Tax Credit Carryforward [Member] | Internal Revenue Service (IRS) [Member]
Operating Loss Carryforwards [Line Items]
Tax credit carryforwards	7.6
Research Tax Credit Carryforward [Member] | Year 2032 [Member] | Internal Revenue Service (IRS) [Member]
Operating Loss Carryforwards [Line Items]
Tax credit carryforwards	1.4
Research Tax Credit Carryforward [Member] | Year After 2032 [Domain] | Internal Revenue Service (IRS) [Member]
Operating Loss Carryforwards [Line Items]
Tax credit carryforwards	4.0
Research Tax Credit Carryforward [Member] | Year After 2022 [Member] | State and Local Jurisdiction [Member]
Operating Loss Carryforwards [Line Items]
Tax credit carryforwards	2.0
Research Tax Credit Carryforward [Member] | Year 2029 [Domain] | Internal Revenue Service (IRS) [Member]
Operating Loss Carryforwards [Line Items]
Tax credit carryforwards	0.2
Research Tax Credit Carryforward [Member] | Year 2030 [Domain] | Internal Revenue Service (IRS) [Member]
Operating Loss Carryforwards [Line Items]
Tax credit carryforwards	1.0
Research Tax Credit Carryforward [Member] | Year 2031 [Member] | Internal Revenue Service (IRS) [Member]
Operating Loss Carryforwards [Line Items]
Tax credit carryforwards	1.0
Research Tax Credit Carryforward [Member] | Year 2021 [Member] | State and Local Jurisdiction [Member]
Operating Loss Carryforwards [Line Items]
Tax credit carryforwards	0.5
Research Tax Credit Carryforward [Member] | Year 2022 [Member] | State and Local Jurisdiction [Member]
Operating Loss Carryforwards [Line Items]
Tax credit carryforwards	$ 0.8