Accumulated Other Comprehensive Loss Accumulated Other Comprehensive Loss Reclassification Adjustment (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Interest expense		$ (202.9)	$ (154.9)	$ (117.3)
Net actuarial gains (losses) recognized due to settlement (net of tax of $(0.1) and $(1.3), respectively)		(1.0)	(3.5)	(0.2)
Currency impact (net of tax of $0.0 and $(0.3), respectively)		0.2	(0.9)	1.3
Total reclassifications for the period		7.2	3.0
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Tax		0.3	0.6	0.1
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, Tax		(0.6)	1.1	3.3
Other Comprehensive Income (Loss), Defined Benefit Plan, Adjustment for Settlement or Curtailment Gain (Loss), Tax		(0.1)	(1.3)	0.4
Other Comprehensive (Income) Loss, Currency Impact, Tax		0.0	(0.3)	$ (1.9)
Interest Rate Hedges
Total reclassifications for the period		3.4	2.6
Interest Rate Hedges | Reclassification out of Accumulated Other Comprehensive Income [Member]
Interest expense		3.4	2.6
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Tax		0.3	0.6
Pension and Other Post-Retirement Benefits
Total reclassifications for the period		3.8	0.4
Pension and Other Post-Retirement Benefits | Reclassification out of Accumulated Other Comprehensive Income [Member]
Net actuarial losses recognized during the year (net of tax of $0.6 and $(1.1), respectively)	[1]	4.6	4.8
Net actuarial gains (losses) recognized due to settlement (net of tax of $(0.1) and $(1.3), respectively)	[1]	(1.0)	(3.5)
Currency impact (net of tax of $0.0 and $(0.3), respectively)	[1]	0.2	(0.9)
Amounts reclassified from AOCI		3.8	0.4
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, Tax		(0.6)	1.1
Other Comprehensive Income (Loss), Defined Benefit Plan, Adjustment for Settlement or Curtailment Gain (Loss), Tax		(0.1)	(1.3)
Other Comprehensive (Income) Loss, Currency Impact, Tax		$ 0.0	$ (0.3)

[1] Pension and other post-retirement benefits AOCI components are included in the computation of net periodic benefit cost (refer to note 15 ).