CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Parenthetical) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Tax on foreign currency translation adjustments	$ 0.2	$ 1.6	$ 11.7
Tax on unrealized losses on cash flow and investment hedges	1.6	0.4	2.2
Tax on reclassification losses included in net income	1.7	2.1	2.6
Tax on amortization of actuarial losses and prior service costs included in net income	4.1	3.0	2.1
Tax on actuarial losses and prior service costs	$ 11.2	$ 22.1	$ 5.2