Business Combinations - Assets Acquired and Liabilities Assumed (Details) - USD ($) $ in Millions	Jun. 30, 2015	Dec. 31, 2014	Jun. 30, 2014
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net [Abstract]
Goodwill	$ 540.6	$ 548.6
Series of Individually Immaterial Business Acquisitions [Member]
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net [Abstract]
Accounts receivable			$ 2.7
Total inventories			4.8
Prepaid and other current assets			4.3
Property and equipment			10.2
Intangible assets			13.7
Goodwill			32.2
Accounts payable			(2.4)
Advanced billings and deposits			(6.5)
Other current liabilities			(4.1)
Deferred income tax liabilities			(2.5)
Other noncurrent accrued liabilities			(2.0)
Consideration, net of cash acquired			$ 50.4