Pension and Other Postretirement Benefit Plans Deferred Compensation Arrangements (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]
Deferred Compensation Arrangement with Individual, Compensation Expense	$ 1.7	$ 1.9	$ 3.5
Deferred Compensation Arrangement with Individual, Employer Contribution	$ 0.3