Consolidated Statements of Comprehensive Income (unaudited) (Parenthetical) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Unrealized gains (losses) arising during the period, tax expense (benefit)	$ (0.5)	$ 0.7	$ (0.1)	$ 1.8
Reclassification adjustments for losses included in net income, tax benefit	2.0	1.0	6.8	2.9
Currency translation adjustment - reclassification adjustment for losses included in net income, tax benefit	0	0.1	0	0.5
Amortization of net actuarial losses, tax benefit	$ 0.4	$ 0.2	$ 1.4	$ 0.9