Benefit Plans - Additional Information (Details) (USD $) In Millions, except Share data in Thousands, unless otherwise specified	12 Months Ended	1 Months Ended	12 Months Ended		3 Months Ended
	Dec. 31, 2014	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2014
Defined Benefit Plan Disclosure [Line Items]
Increase in pension plan obligations	$ 1.3
Increase in postretirement benefit plan obligations	4.4
Result of 50 basis point change in the expected long-term rate of return	0.5
Defined benefit plans in accumulated other comprehensive income expected to be recognized in 2015	0.2
Estimated cash contributions by employer in 2015	2.4
Projected health-care cost trend rate in 2015	7.20%
Ultimate health-care cost trend rate in 2029	4.50%
Year that rate reaches Ultimate health-care cost trend rate	2029	2029			2029
Equity Securities
Defined Benefit Plan Disclosure [Line Items]
Asset mix of securities	60.00%
Debt Securities
Defined Benefit Plan Disclosure [Line Items]
Asset mix of securities	40.00%
Foreign Pension Plan, Defined Benefit
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan Number Of Plan Participants	280	280			280
Defined Benefit Plan Plan Participants Number Of Active Employees	100	100			100
Foreign Pension Plan, Defined Benefit | Minimum
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, estimated one-time termination benefits in next fiscal year		8
Defined benefit plan, estimated one-time termination benefits in next fiscal year, net of tax		6
Foreign Pension Plan, Defined Benefit | Maximum
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, estimated one-time termination benefits in next fiscal year		11
Defined benefit plan, estimated one-time termination benefits in next fiscal year, net of tax		8
Pension Costs
Defined Benefit Plan Disclosure [Line Items]
Amount of basis point change	0.50%
Cash contributions to pension plans	3.3		17.5
Funded status at end of year, recorded in Pension and Postretirement Benefits	0.6	0.6	(0.4)		0.6
Deferred Profit Sharing
Defined Benefit Plan Disclosure [Line Items]
Amounts charged to earnings for defined contribution profit sharing plan	12.5		15.8	13.5
Defined Contribution Pension
Defined Benefit Plan Disclosure [Line Items]
Amounts charged to earnings for defined contribution profit sharing plan	4.5		4.5	3.8
Percentage of employer matching	50.00%
Percentage of employee gross pay employer contributes 50%	6.00%
Employer contribution description	The Company currently matches 50% of each employee’s contribution up to a maximum of 6% of the employee’s earnings.
Deferred Compensation Plans
Defined Benefit Plan Disclosure [Line Items]
Deferred compensation liability	92.2	92.2	83.5		92.2
Funded status at end of year, recorded in Pension and Postretirement Benefits	70.1	70.1	62.8		70.1
Amounts charged to earnings	$ 1.8		$ 2.8	$ 2.6
Shares held in rabbi trust	167	167			167
Deferred Compensation Plans | Management
Defined Benefit Plan Disclosure [Line Items]
Eligible percentage of regular compensation, maximum	85.00%
Deferred Compensation Plans | Director
Defined Benefit Plan Disclosure [Line Items]
Vesting percentage					100.00%