Accumulated Other Comprehensive Income (Loss) Reclassification Adjustments (Details) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2017	Mar. 31, 2016
Interest expense		$ (30.8)	$ (11.5)
Total reclassifications for the period		(4.2)	0.8
Interest Rate Hedges | Reclassification out of Accumulated Other Comprehensive Income [Member]
Interest expense		(0.3)	(0.1)
Net actuarial loss amortization | Reclassification out of Accumulated Other Comprehensive Income [Member]
Net periodic benefit cost	[1]	(3.9)	0.9
Net actuarial loss amortization, tax		1.5	(0.5)
Pension and Other Post-retirement Benefits
Total reclassifications for the period		$ (3.9)	$ 0.9

[1] Pension and other post-retirement benefits AOCI components are included in the computation of net periodic benefit cost (refer to note 14).