Employee Benefit Plans - Combined Amount Of Net Periodic Benefit Cost Recognized (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Components of net periodic pension benefit cost
Service cost	$ 0.7	$ 0.6	$ 1.4	$ 1.2
Interest cost	1.2	1.3	2.4	2.6
Expected return on plan assets	(1.7)	(1.7)	(3.4)	(3.3)
Amortization of actuarial gains	0.3	0.1	0.6	0.3
Curtailments	0.0	0.1	0.0	0.2
Amortization of prior service costs	(0.1)	0.0	(0.1)	(0.1)
Net periodic cost	$ 0.4	$ 0.4	$ 0.9	$ 0.9