Subsequent Events (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	0 Months Ended	12 Months Ended
	Jul. 30, 2013	Dec. 31, 2014
Dividend Declared | Class A Common Stock
Subsequent events
Quarterly dividend declared (in dollars per share)	$ 0.13
Dividend Declared | Class B Common Stock
Subsequent events
Quarterly dividend declared (in dollars per share)	$ 0.13
Subsequent event | European Restructuring Program
Subsequent events
Reduction in European manufacturing footprint authorized under the restructuring program	10.00%
Subsequent event | Estimated | European Restructuring Program
Subsequent events
Expected pre-tax charge to earnings	$ 14.0	$ 9.8
Net after-tax charge	$ 10.0