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Retirement Benefits - Schedule of Net Benefit Costs (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]        
Service cost $ 0.4 $ 0.4 $ 1.1 $ 1.1
Interest cost 0.5 0.8 1.4 1.9
Expected return on plan assets (0.5) (0.8) (1.6) (2.1)
Amortization of net actuarial losses [1] 0.1 0.1 0.5 0.3
Amortization of transitional obligation (0.1) 0.0 (0.1) 0.0
Net periodic pension cost $ 0.4 $ 0.5 $ 1.3 $ 1.2
[1] Reflects amounts reclassified from accumulated other comprehensive income (loss) to net income.