Contingencies - Legal and Regulatory Matters Narrative (Details) £ in Millions, $ in Millions	1 Months Ended		12 Months Ended
	Jan. 31, 2014 USD ($) claim	Jan. 31, 2014 GBP (£) claim	Dec. 31, 2015 USD ($) claim	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)
Loss Contingencies [Line Items]
Settlement, amount			$ (422.0)	$ (173.0)	$ 17.0
Foreign Exchange
Loss Contingencies [Line Items]
Estimate of possible loss			$ 565.0
Putative Class Action
Loss Contingencies [Line Items]
Number of pending claims | claim			2
Transition Management
Loss Contingencies [Line Items]
Litigation reserve			$ 2.0
Claims settled | claim	6	6
Legal Reserve | Transition Management
Loss Contingencies [Line Items]
Legal reserves			$ 612.0
Regulatory Matter | Transition Management
Loss Contingencies [Line Items]
Settlement, amount	$ 37.8	£ 22.9