Employee Benefit Plans - Combined Amount Of Net Periodic Benefit Cost Recognized (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
Components of net periodic pension benefit cost
Service cost	$ 0.6	$ 0.6	$ 1.2	$ 1.2
Interest cost	1.3	1.2	2.6	2.4
Expected return on plan assets	(1.7)	(1.4)	(3.3)	(2.8)
Amortization of actuarial gains	0.1	0.3	0.3	0.5
Curtailments	0.1	0	0.2	0
Amortization of prior service costs	0	(0.1)	(0.1)	(0.1)
Net periodic cost	$ 0.4	$ 0.6	$ 0.9	$ 1.2