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Segment information - Information About Unconsolidated Equity Affiliates (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Unconsolidated Equity Affiliates held by International Segment [Abstract]
Carrying value of investments at year end	$ 2.7us-gaap_EquityMethodInvestments	$ 15.8us-gaap_EquityMethodInvestments
Share of earnings of unconsolidated equity affiliates	4.3	6.7	6.0
Asia Pacific [Member] \| Global Markets [Member]
Unconsolidated Equity Affiliates held by International Segment [Abstract]
Carrying value of investments at year end	2.7	2.3	1.8
Share of earnings of unconsolidated equity affiliates	0.5	0.7	0.2
Undistributed earnings of equity affiliates included in consolidated retained earrings [Abstract]
Undistributed earnings	$ 1.1	$ 0.8	$ 0.4

This item represents the entity's proportionate share for the period of the net income (loss) of its investee (such as unconsolidated subsidiaries and joint ventures) to which the equity method of accounting is applied. This item includes income or expense related to stock-based compensation based on the investor's grant of stock to employees of an equity method investee.

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