Consolidated Statements of Comprehensive Income (Parenthetical) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Unrealized gains (losses) arising during the period, tax expense (benefit)	$ 0.8	$ 4.2	$ (1.9)
Reclassification adjustments for losses included in net income, tax benefit	8.7	3.2	2.3
Currency translation adjustment – reclassification adjustment for losses included in net income, tax benefit	0	0.4	0
Unrealized gains (losses) arising during the period, tax expense (benefit)	31.0	(17.8)	(17.5)
Amortization of net actuarial losses, tax benefit	$ 1.9	$ 1.1	$ 0.6