Contingencies - Narrative (Details) £ in Millions, $ in Millions	1 Months Ended		12 Months Ended
	Jan. 31, 2014 USD ($) claim	Jan. 31, 2014 GBP (£) claim	Dec. 31, 2015 USD ($)	Mar. 31, 2016 USD ($) claim
Loss Contingencies [Line Items]
Unrecognized tax benefits			$ 63.0	$ 63.0
Transition Management
Loss Contingencies [Line Items]
Claims settled | claim	6	6
Litigation reserve				$ 2.0
Putative Class Action
Loss Contingencies [Line Items]
Number of pending claims | claim				2
Foreign Exchange
Loss Contingencies [Line Items]
Estimate of possible loss				$ 565.0
Legal Reserve | Transition Management
Loss Contingencies [Line Items]
Legal reserves				575.0
Regulatory Matter | Transition Management
Loss Contingencies [Line Items]
Settlement, amount	$ 37.8	£ 22.9
Cumulative Adjustment for Incorrect Revenue Recognition
Loss Contingencies [Line Items]
Cumulative adjustment to revenue				$ 240.0
Revenue recognition period			18 years