Accumulated Other Comprehensive Income (Loss) Reclassification Adjustments (Details) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
		Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Interest expense		$ (32.4)	$ (8.5)	$ (68.2)	$ (24.1)
Total reclassifications for the period		(0.1)	1.0	1.7	3.1
Interest Rate Hedges | Reclassification out of Accumulated Other Comprehensive Income [Member]
Interest expense		0.0	(0.1)	(0.1)	(0.2)
Net actuarial loss amortization | Reclassification out of Accumulated Other Comprehensive Income [Member]
Net periodic benefit cost	[1]	(0.1)	1.1	1.8	3.4
Net actuarial loss amortization, tax		(0.3)	(0.6)	(1.3)	(1.9)
Net prior service benefit amortization | Reclassification out of Accumulated Other Comprehensive Income [Member]
Net periodic benefit cost	[1]	0.0	0.0	0.0	(0.1)
Pension and Other Post-retirement Benefits
Total reclassifications for the period		(0.1)	1.1	1.8	3.3
Pension and Other Post-retirement Benefits | Reclassification out of Accumulated Other Comprehensive Income [Member]
Net periodic benefit cost		$ (0.1)	$ 1.1	$ 1.8	$ 3.3

[1] Pension and other post-retirement benefits AOCI components are included in the computation of net periodic benefit cost (refer to note 13).