Quarterly report pursuant to Section 13 or 15(d)

Goodwill and Other Intangible Assets - Additional Information (Details)

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Goodwill and Other Intangible Assets - Additional Information (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Goodwill and Intangible Assets Disclosure [Abstract]        
Amortization of intangible assets $ 5.1 $ 4.1 $ 10.1 $ 7.9