Income Taxes - Operating Loss Carryforwards (Details) $ in Millions	Dec. 31, 2015 USD ($)
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	$ 469.8
Tax Credit carryforwards	32.6
United States
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	370.7
International
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	101.4
2018
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	0.0
2019
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	0.0
2021
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	40.0
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	93.1
2028
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	12.1
2029
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	114.6
No Expiration Date
Operating Loss Carryforwards [Line Items]
Tax Credit carryforwards	$ 8.7