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).