Consolidated Statements of Comprehensive Income (Parenthetical) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Unrealized gain (loss) arising during the period, tax expense (benefit)	$ 4.2	$ (1.9)	$ (10.4)
Reclassification adjustments for losses included in net income, tax expense	3.2	2.3	1.3
Currency translation adjustment – reclassification adjustment for loss included in net income, tax expense	0.4	0	0
Unrealized gain (loss) arising during the period, tax expense (benefit)	(17.8)	(17.5)	4.4
Amortization of net actuarial loss, tax expense	1.1	0.6	0.8
Other, tax benefit	$ 0	$ 0	$ 0.7