Income Taxes Operating Loss Carryforwards (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2014
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	$ 712.3
Tax Credit carryforwards	28.8
2018
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	0
2019
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	141.3
2021
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	141.2
2022
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	1.4
2023
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	67.9
2024
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	117.8
2026
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	22.9
2027
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	93.0
2028
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	12.2
2029
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	114.6
No Expiration Date
Operating Loss Carryforwards [Line Items]
Tax Credit carryforwards	8.7
United States
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	558.9
International
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	$ 129.4