Basis of Presentation Settlement of Pension Withdrawal Liability (Details) - USD ($) $ in Millions	9 Months Ended
Sep. 30, 2015	Jun. 30, 2015
Defined Benefit Plan Disclosure [Line Items]
Long-term pension withdrawal liability	$ 2.0	$ 3.0
Pension expense	1.0
Payment of pension withdrawal liability	$ 2.0

The amount of pension benefit costs recognized during the period for (1) defined benefit plans and (2) defined contribution plans. For defined benefit plans, pension expense includes the following components: service cost, interest cost, expected return on plan assets, gain (loss) on plan assets, prior service cost or credit, transition asset or obligation, and gain (loss) due to settlements or curtailments. For defined contribution plans, the pension expense generally equals the firm's contribution to employees' accounts (if the firm contributes) during the period.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

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Name:	us-gaap_PensionExpense
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration