Pension And Other Retiree Benefits (Net Periodic Benefit Expense) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Jan. 31, 2017
Defined Benefit Plan Disclosure [Line Items]
Expected contributions to defined benefit plans for 2017	$ 20.9		$ 20.9
Contributions by company to date			17.1
Esselte Group Holdings AB
Defined Benefit Plan Disclosure [Line Items]
Expected contributions to defined benefit plans for 2017	8.7		8.7
Pension obligations					$ 171.5
GERMANY | Esselte Group Holdings AB
Defined Benefit Plan Disclosure [Line Items]
Pension obligations					$ 133.7
Pension | U.S.
Defined Benefit Plan Disclosure [Line Items]
Service cost	0.3	$ 0.4	1.0	$ 1.0
Interest cost	1.8	1.8	5.3	5.4
Expected return on plan assets	(3.1)	(2.9)	(9.2)	(8.9)
Amortization of net loss (gain)	0.5	0.4	1.5	1.4
Amortization of prior service cost	0.1	0.1	0.3	0.3
Curtailment gain	0.0	0.0	0.0	0.0
Net periodic benefit income	(0.4)	(0.2)	(1.1)	(0.8)
Pension | International
Defined Benefit Plan Disclosure [Line Items]
Service cost	0.4	0.2	1.2	0.6
Interest cost	3.6	2.5	10.0	7.9
Expected return on plan assets	(5.6)	(4.2)	(16.1)	(13.4)
Amortization of net loss (gain)	0.7	0.5	2.2	1.7
Amortization of prior service cost	0.0	0.0	0.0	0.0
Curtailment gain	0.0	0.0	0.0	0.0
Net periodic benefit income	(0.9)	(1.0)	(2.7)	(3.2)
Post-retirement
Defined Benefit Plan Disclosure [Line Items]
Service cost	0.0	0.0	0.0	0.0
Interest cost	0.0	0.0	0.1	0.2
Expected return on plan assets	0.0	0.0	0.0	0.0
Amortization of net loss (gain)	(0.1)	(0.1)	(0.3)	(0.3)
Amortization of prior service cost	0.0	0.0	0.0	0.0
Curtailment gain	0.0	(0.6)	0.0	(0.6)
Net periodic benefit income	$ (0.1)	$ (0.7)	$ (0.2)	$ (0.7)