Income Tax Valuation Allowance (Details6) $ in Millions	3 Months Ended	12 Months Ended
	Sep. 30, 2015 USD ($)	Dec. 31, 2015 USD ($) year	Dec. 31, 2014 USD ($) year
Valuation Allowance [Line Items]
Valuation allowance for deferred tax assets		$ 105.1	$ 34.4
Number of Years in Cumulative Loss Profit Position | year		3	3
Deferred tax asset valuation allowance charge	$ 63.9	$ 68.4
Amount of valuation allowance in the effective tax rate (percent)		4.00%
Discrete Item [Member]
Valuation Allowance [Line Items]
Deferred tax asset valuation allowance charge		$ 49.3
Part of Effective Tax Rate [Member]
Valuation Allowance [Line Items]
Deferred tax asset valuation allowance charge		19.1
Federal [Member]
Valuation Allowance [Line Items]
Valuation allowance for deferred tax assets		24.8
State net operating loss carryforwards [Member]
Valuation Allowance [Line Items]
Valuation allowance for deferred tax assets		61.8
Foreign Net Operating Losses and Credits [Member]
Valuation Allowance [Line Items]
Valuation allowance for deferred tax assets		1.4
State tax credits [Member]
Valuation Allowance [Line Items]
Valuation allowance for deferred tax assets		13.8
State temporary differences [Member]
Valuation Allowance [Line Items]
Valuation allowance for deferred tax assets		$ 3.3
State [Member]
Valuation Allowance [Line Items]
Operating loss carryforward period		20 years
Maximum tax benefit available per year amount		$ 5.0
Maximum tax benefit available per year percent of income		30.00%