Pension and Other Post-Retirement Plans - Amounts in Accumulated Other Comprehensive Income (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2014
Amounts included in accumulated other comprehensive income expected to be recognized as components of net periodic pension cost in next fiscal year
Net (gain) or loss	$ 1.1
Net prior service cost	(0.2)
Net amount expected to be recognized	$ 0.9

Amount included in accumulated other comprehensive income (AOCI) expected to be recognized as components of net periodic benefit cost for the fiscal year that follows the most recent annual statement of financial position, including gain (loss), prior service cost (credit), and transition asset (obligation).

No definition available.

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