Income Tax Matters, Tax Uncertainties (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013		Dec. 31, 2012
Other, settlements from tax audit
Cash tax benefit from settlement of tax audit	$ 7.9
Cash received from settlement of tax audit	1.8	6.1
Cash tax benefit from advance pricing agreement	0	2.9		0
Reconciliation of changes in the gross unrecognized tax benefits:
Gross unrecognized tax benefits at beginning of period	3.8	15.7		13.7
Gross increases for tax positions of prior years	0	0		1.3
Gross decreases for tax positions of prior years	0	(7.6)		(0.1)
Gross increases for tax positions of current years	0	0		0.4
Gross decrease for tax positions relating to lapse of a statute of limitation	(1.4)	(3.3)		0
Foreign currency translation	(0.2)	(1.0)		0.4
Gross unrecognized tax benefits at end of period	2.2	3.8		15.7
Unrecognized tax benefits that would impact effective tax rate if recognized	1.1	2.7
Unrecognized tax benefits, income tax penalties and interest accrued:
Accrued interest and penalties on unrecognized tax benefits	1.4	2.3
Accrued interest and penalties on unrecognized tax benefits, current	0
(Decrease) increase in interest and penalty	(0.9)	(5.2)		0.9
Foreign currency impact on gross unrecognized tax benefit (including interest and penalties) which increased (decreased) Other comprehensive income (loss)	0.4	0.2	[1]	(0.2)
FIN 48
Unrecognized tax benefits, income tax penalties and interest accrued:
Foreign currency impact on gross unrecognized tax benefit (including interest and penalties) which increased (decreased) Other comprehensive income (loss)	0.3	0.7		(0.5)
Canada Revenue Agency
Other, settlements from tax audit
Cash tax benefit from advance pricing agreement		$ 2.6

[1] The presentation of other comprehensive income in the table above has been revised from the prior year presentation to reflect separate amounts for actuarial gains and losses and prior service costs related to plan amendments. The 2013 balances were adjusted to reflect this reclassification. The impacts to the prospective amortization of Prior service cost and Accumulated net actuarial (losses) gains were not material.