Benefit Plans (Textuals) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Defined Benefit Plan Disclosure [Line Items]
Pension settlement charge	$ 0.0	$ 50.4	$ 0.0
401 (k) plan contributions	4.9	4.8	4.3
Accumulated benefit obligation	258.4	238.9
Expected contribution to the plan	$ 23.0
Assumed healthcare cost trend rate, benefit obligation	6.60%
Ultimate healthcare cost trend rate, benefit obligation	5.00%
Effect of one percentage point increase on benefit obligation	$ 0.2
Effect of one percentage point decrease on benefit obligation	$ 0.2
Assumed healthcare cost trend rate, net periodic benefit cost	7.00%
Ultimate healthcare cost trend rate, net periodic benefit cost	5.00%
Effect of one percentage point increase on service and interest cost	$ 0.1
Defined Benefit Plan, Recognized Net Gain (Loss) Due to Annuity Purchase		47.0
Settlement		$ 139.4
Number of Employees & Beneficiaries Affected by Settlement		1,750
Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension settlement charge	0.0	$ 50.4	$ 0.0
Actuarial net loss that will be amortized from accumulated other comprehensive loss	4.7
Prior service credit that will be amortized from accumulated other comprehensive loss	$ 1.4
Discount rate	3.68%	4.22%
Rate of compensation increase	4.04%	4.07%
Long-term rate of return on assets	6.95%	6.84%	7.01%
Settlement	$ 0.0	$ 149.7
International Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Accumulated benefit obligation	60.6	$ 55.5
Expected contribution to the plan	$ 1.9
Discount rate	2.25%	3.19%
Rate of compensation increase	2.59%	2.73%
U.S. Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Discount rate	4.15%	4.55%
Rate of compensation increase	4.25%	4.25%
Percentage of global plan assets	85.00%
Long-term rate of return on assets	7.25%	7.25%	7.25%
U.S. SERP Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Expected contribution to the plan	$ 1.1
Other Retirement Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension settlement charge	0.0	$ 0.0	$ 0.0
Actuarial net loss that will be amortized from accumulated other comprehensive loss	2.3
Prior service credit that will be amortized from accumulated other comprehensive loss	0.7
Expected contribution to the plan	$ 0.7
Discount rate	3.90%	4.30%
Settlement	$ 0.0	$ 0.0