Employee Benefit Plans - Combined Amount Of Net Periodic Benefit Cost Recognized (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Components of net periodic pension benefit cost
Service cost	$ 0.7	$ 0.7	$ 1.9	$ 1.9
Interest cost	1.3	1.1	3.9	3.5
Expected return on plan assets	(1.6)	(1.4)	(4.9)	(4.2)
Amortization of actuarial gains	0.2	0.3	0.5	0.8
Curtailments	0	0	0.2	0
Amortization of prior service costs	(0.1)	(0.1)	(0.2)	(0.2)
Net periodic cost	$ 0.5	$ 0.6	$ 1.4	$ 1.8