Income Taxes (Deferred Tax Assets and Liabilities) (Details) - USD ($) $ in Millions	Dec. 31, 2016	Dec. 31, 2015
Operating Loss Carryforwards [Line Items]
Deferred Tax Assets, Operating Loss Carryforwards, Foreign	$ 1.4
Deferred Tax Assets, Operating Loss Carryforwards, State and Local	14.0
Deferred tax assets
Net operating loss carryforwards	15.4	$ 16.5
Tax credit carryforwards	27.9	40.8
Restructuring and impairment charges	2.9	0.0
Pension and deferred compensation	46.4	42.0
Other	19.5	19.3
Valuation allowance	(18.7)	(20.1)
Total deferred tax assets	93.4	98.5
Deferred tax liabilities:
Accelerated depreciation	30.3	35.0
Other	6.1	5.4
Total deferred tax liabilities	36.4	40.4
Net deferred tax asset	57.0	$ 58.1
State and Local Jurisdiction [Member]
Operating Loss Carryforwards [Line Items]
Operating Loss Carryforwards	254.8
Foreign Tax Authority [Member]
Operating Loss Carryforwards [Line Items]
Tax Credit Carryforward, Amount	8.2
Operating Loss Carryforwards	9.4
Deferred Tax Assets, Operating Loss Carryforwards, Not Subject to Expiration	6.2
Year After 2016 [Domain] | State and Local Jurisdiction [Member]
Operating Loss Carryforwards [Line Items]
Operating Loss Carryforwards	249.5
Year 2019 [Member] | Foreign Tax Authority [Member]
Operating Loss Carryforwards [Line Items]
Tax Credit Carryforward, Amount	3.2
Year 2020 [Member] | State and Local Jurisdiction [Member]
Operating Loss Carryforwards [Line Items]
Tax Credit Carryforward, Amount	0.9
Year 2020 [Member] | Foreign Tax Authority [Member]
Operating Loss Carryforwards [Line Items]
Tax Credit Carryforward, Amount	5.0
Year 2016 [Domain] | State and Local Jurisdiction [Member]
Operating Loss Carryforwards [Line Items]
Operating Loss Carryforwards	5.3
Research Tax Credit Carryforward [Member] | State and Local Jurisdiction [Member]
Operating Loss Carryforwards [Line Items]
Tax Credit Carryforward, Amount	3.0
Research Tax Credit Carryforward [Member] | Internal Revenue Service (IRS) [Member]
Operating Loss Carryforwards [Line Items]
Tax Credit Carryforward, Amount	12.0
Research Tax Credit Carryforward [Member] | Year 2028 [Member] | Internal Revenue Service (IRS) [Member]
Operating Loss Carryforwards [Line Items]
Tax Credit Carryforward, Amount	0.6
Research Tax Credit Carryforward [Member] | Year 2029 [Domain] | Internal Revenue Service (IRS) [Member]
Operating Loss Carryforwards [Line Items]
Tax Credit Carryforward, Amount	1.1
Research Tax Credit Carryforward [Member] | Year 2030 [Domain] | Internal Revenue Service (IRS) [Member]
Operating Loss Carryforwards [Line Items]
Tax Credit Carryforward, Amount	1.0
Research Tax Credit Carryforward [Member] | Year 2031 [Member] | Internal Revenue Service (IRS) [Member]
Operating Loss Carryforwards [Line Items]
Tax Credit Carryforward, Amount	1.0
Research Tax Credit Carryforward [Member] | Year 2032 [Member] | Internal Revenue Service (IRS) [Member]
Operating Loss Carryforwards [Line Items]
Tax Credit Carryforward, Amount	1.4
Research Tax Credit Carryforward [Member] | Year 2033 [Member] [Member] | Internal Revenue Service (IRS) [Member]
Operating Loss Carryforwards [Line Items]
Tax Credit Carryforward, Amount	1.4
Research Tax Credit Carryforward [Member] | Year After 2033 [Domain] [Member] | Internal Revenue Service (IRS) [Member]
Operating Loss Carryforwards [Line Items]
Tax Credit Carryforward, Amount	5.5
Research Tax Credit Carryforward [Member] | Year 2021 [Member] | State and Local Jurisdiction [Member]
Operating Loss Carryforwards [Line Items]
Tax Credit Carryforward, Amount	0.2
Research Tax Credit Carryforward [Member] | Year 2022 [Member] | State and Local Jurisdiction [Member]
Operating Loss Carryforwards [Line Items]
Tax Credit Carryforward, Amount	0.8
Research Tax Credit Carryforward [Member] | Year 2023 [Member] | State and Local Jurisdiction [Member]
Operating Loss Carryforwards [Line Items]
Tax Credit Carryforward, Amount	0.5
Research Tax Credit Carryforward [Member] | Year After 2023 [Member] | State and Local Jurisdiction [Member]
Operating Loss Carryforwards [Line Items]
Tax Credit Carryforward, Amount	$ 1.5