Income Taxes - Uncertain Tax Positions (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Reconciliation of the total amounts of uncertain tax positions
Balance at January 1,	$ 12.9	$ 7.0	$ 4.3
Increases in prior period tax positions	0.0	0.5	0.0
Decreases in prior period tax positions	(2.6)	0.0	(2.2)
Increases in current period tax positions	0.6	5.5	5.3
Decreases due to lapse of statute of limitations	(0.3)	0.0	0.0
Decreases due to settlements with tax authorities	0.0	0.0	(0.2)
Decreases from foreign exchange rate changes	(0.3)	(0.1)	(0.2)
Balance at December 31,	10.3	12.9	$ 7.0
Benefit for uncertain tax positions, if recognized	9.3
Accrued for interest and penalties related to uncertain income tax positions	0.2	0.4
FiberMark
Reconciliation of the total amounts of uncertain tax positions
Various uncertain tax positions balance		4.7
Purchase price for uncertain tax position for goodwill		3.7
Purchase price for uncertain tax position for other current assets		1.0
Deferred Tax Asset
Reconciliation of the total amounts of uncertain tax positions
Balance at January 1,	8.9
Balance at December 31,	7.6	8.9
Deferred Tax Liability
Reconciliation of the total amounts of uncertain tax positions
Balance at January 1,	1.2
Balance at December 31,	1.2	1.2
Other Noncurrent Liabilities
Reconciliation of the total amounts of uncertain tax positions
Balance at January 1,	2.8
Balance at December 31,	$ 1.5	$ 2.8