Other Income Tax - Additional Information (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2016	Dec. 31, 2015
Operating Loss Carryforwards
Deferred Tax Assets, Tax Credit Carryforwards, Alternative Minimum Tax	$ 0.6
Operating Loss Carryforwards	1.0
Deferred Tax Assets, Valuation Allowance	$ 1.3
2020 UK Tax Rate	17.00%
2020 UK Tax Rate Prior to 2016 Enactment	18.00%
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Amount	$ 4.5
Reduction in Reserve for Uncertain Tax Positions		$ 19.3
Reduction in Federal Income Taxes		$ 5.8
State and Local Jurisdiction
Operating Loss Carryforwards
Operating Loss Carryforwards	156.4
Deferred Tax Assets, Operating Loss Carryforwards	16.0
Operating Loss Carryforwards, Valuation Allowance	$ 14.1
Maximum
Operating Loss Carryforwards
Operating Loss Carryforwards, Expiration Date	Dec. 31, 2035
Minimum
Operating Loss Carryforwards
Operating Loss Carryforwards, Expiration Date	Jan. 01, 2020