Commitments and Contingencies (Details) $ in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Jun. 30, 2018 USD ($)	Mar. 31, 2017 USD ($)	Jun. 30, 2018 CAD ($)	Dec. 31, 2014 USD ($)
Loss Contingency, Damages Sought, Value			$ 10.0
Operating Leases
Product Warranty Expense	$ 14.1	$ 9.8
Prior To 1995 [member]
Walter Energy tax assessment				$ 33.0
IRS-Walter Energy Claim 1 [Member]
Loss Contingency, Estimate of Possible Loss	554.3
IRS-Walter Energy Claim 1 Priority [Member]
Loss Contingency, Estimate of Possible Loss	229.1
IRS-Walter Energy Claim 2 [Member]
Loss Contingency, Estimate of Possible Loss	860.4
IRS-Walter Energy Claim 2 Priority [Member]
Loss Contingency, Estimate of Possible Loss	$ 535.3