Accumulated Other Comprehensive Loss Reclassification Adjustments (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Interest Expense $ 8.0 $ 6.9
Reclassification out of Accumulated Other Comprehensive Income [Member]    
Total reclassifications for the period 1.0 0.4
Accumulated Net Gain (Loss) from Interest Rate Hedge [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]    
Interest Expense (0.1) (0.1)
Accumulated Defined Benefit Plans Adjustment [Member]    
Net actuarial loss amortization, tax 0 0
Accumulated Defined Benefit Plans Adjustment [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]    
Net actuarial loss amortization 0.1 [1] 0.5 [1]
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net Prior Service Costs Arising During Period, Tax 0 (0.6)
Net prior service cost amortization (net of tax of $(0.6) and $0.0, respectively) 1.0 [1] 0 [1]
Amounts reclassified from AOCI $ 1.1 $ 0.5
[1] Pension and other post-retirement benefits AOCI components are included in the computation of net periodic benefit cost (refer to note 12 to the condensed consolidated financial statements).