Pension Plans (Other Plans) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2016
Defined Benefit Plan Disclosure [Line Items]
Actual return on pension plan assets	(3.40%)
Maximize return	51.10%
Liquidity	48.90%
Defined contribution, maximum contribution limit	5.00%
Defined contribution plan, employer contributions	$ 11.9	$ 11.2	$ 10.4
Other Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Expected return on plan assets	7.50%	7.50%
Managers’ securities holdings percentage maximum limit of total market value	7.50%
Forecast [Member]
Defined Benefit Plan Disclosure [Line Items]
Effect of of plan change on pension expense				$ 4.6
Other Accruals and Payables [Member]
Defined Benefit Plan Disclosure [Line Items]
Net pension liability amounts recognized in balance sheet	$ 0.1