Acquisitions (Narrative) (Details) (USD $) In Millions, unless otherwise specified		9 Months Ended		9 Months Ended		9 Months Ended				9 Months Ended
	Mar. 31, 2012 January 1, 2012 Thompson Insurance Enterprises, LLC [Member]	Sep. 30, 2012 January 1, 2012 Thompson Insurance Enterprises, LLC [Member] Customer Relationships [Member]	Mar. 31, 2012 January 1, 2012 Thompson Insurance Enterprises, LLC [Member] Customer Relationships [Member]	Sep. 30, 2012 January 1, 2012 Thompson Insurance Enterprises, LLC [Member] Trade Names [Member]	Mar. 31, 2012 January 1, 2012 Thompson Insurance Enterprises, LLC [Member] Trade Names [Member]	Sep. 30, 2012 January 1, 2012 Thompson Insurance Enterprises, LLC [Member] Unpatented Technology [Member]	Mar. 31, 2012 January 1, 2012 Thompson Insurance Enterprises, LLC [Member] Unpatented Technology [Member]	Apr. 18, 2012 April 18, 2012 Havco WP LLC [Member]	Sep. 30, 2012 2012 Non-insurance Acquisitions [Member]	Sep. 30, 2012 2012 Non-insurance Acquisitions [Member] Customer Relationships [Member]	Jul. 04, 2012 Tromp Bakery Equipment [Member]	Sep. 05, 2012 Reading Bakery Systems [Member]	Sep. 30, 2012 Non-insurance Acquisitions In Other Assets [Member]
Business Acquisition [Line Items]
Percentage of voting interests acquired	100.00%							85.00%			100.00%	85.00%
Total consideration	$ 108.5												$ 69.7
Cash consideration	100.5								92.6
Goodwill recognized	26.1								11.5
Other intangible assets recognized	81.2		68.5		11.5		1.0		28.2	21.2
Redeemable noncontrolling interest recognized, fair value									$ 7.9
Weighted average amortization period, years		23 years		10 years		3 years				16 years