Business Combinations (Details) (USD $) In Millions, unless otherwise specified	Feb. 03, 2012
Business Acquisition, Purchase Price Allocation [Abstract]
Cash and cash equivalents	$ 4.5
Trade accounts receivable	7.3
Other assets	1.6
Intangible assets	198.6
Goodwill	204.5
Total assets	416.5
Other current liabilities	10.6
Deferred tax liabilities	86.4
Deferred revenue	13.6
Total liabilities	110.6
Net assets acquired	$ 305.9