Other Comprehensive Income (Loss) (Schedule of Changes in AOCL by Component) (Details) - USD ($)	3 Months Ended	9 Months Ended
Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Accumulated Other Comprehensive Income (Loss) [Line Items]
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net	$ 7,700,000
Other comprehensive income (loss)
Total Other Comprehensive Income (Loss), net of tax	11,400,000	$ (4,900,000)	$ (29,700,000)	$ (26,800,000)
Accumulated other comprehensive loss
Beginning balance			1,573,300,000
Net activity	11,400,000	(4,900,000)	(29,700,000)	(26,800,000)
Ending balance	1,652,400,000		1,652,400,000
Income tax expense	26,300,000	13,100,000	39,000,000.0	31,700,000
Net Income (Loss) Attributable to Parent	93,900,000	32,600,000	180,600,000	124,300,000
Available-for-sale Securities and Hedges [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification				(800,000)
Other comprehensive income (loss)
Prior to reclassification	(6,000,000.0)	(10,800,000)	(39,700,000)	(14,200,000)
Reclassification from	(2,900,000)	(1,400,000)	(2,400,000)	(5,400,000)
Pre-tax	(8,900,000)	(12,200,000)	(42,100,000)	(19,600,000)
Tax effect	2,200,000	2,800,000	9,700,000	4,600,000
Total Other Comprehensive Income (Loss), net of tax	(6,700,000)	(9,400,000)	(32,400,000)	(15,000,000.0)
Accumulated other comprehensive loss
Beginning balance	(18,500,000)	12,000,000.0	7,200,000	16,800,000
Net activity	(6,700,000)	(9,400,000)	(32,400,000)	(15,000,000.0)
Ending balance	(25,200,000)	2,600,000	(25,200,000)	2,600,000
Net Income (Loss) Attributable to Parent	2,100,000	1,200,000	1,800,000	4,100,000
Foreign Currency Translation Adjustment [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification				0
Other comprehensive income (loss)
Prior to reclassification	17,100,000	4,100,000	8,600,000	(13,100,000)
Reclassification from	0	0	0	0
Pre-tax	17,100,000	4,100,000	8,600,000	(13,100,000)
Tax effect	0	0	0	0
Total Other Comprehensive Income (Loss), net of tax	17,100,000	4,100,000	8,600,000	(13,100,000)
Accumulated other comprehensive loss
Beginning balance	(153,900,000)	(122,500,000)	(145,400,000)	(105,300,000)
Net activity	17,100,000	4,100,000	8,600,000	(13,100,000)
Ending balance	(136,800,000)	(118,400,000)	(136,800,000)	(118,400,000)
Change in Pension and Postretirement Defined Benefit Plans [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification				6,200,000
Other comprehensive income (loss)
Prior to reclassification	200,000	0	100,000	100,000
Reclassification from	1,400,000	700,000	(7,700,000)	1,800,000
Pre-tax	1,600,000	700,000	(7,600,000)	1,900,000
Tax effect	600,000	300,000	(1,700,000)	600,000
Total Other Comprehensive Income (Loss), net of tax	1,000,000.0	400,000	(5,900,000)	1,300,000
Accumulated other comprehensive loss
Beginning balance	(51,200,000)	(29,800,000)	(44,300,000)	(24,500,000)
Net activity	1,000,000.0	400,000	(5,900,000)	1,300,000
Ending balance	(50,200,000)	(29,400,000)	(50,200,000)	(29,400,000)
Income tax expense	(600,000)	(300,000)	1,700,000	(6,800,000)
Change in Pension and Postretirement Defined Benefit Plans [Member] \| Reclassification out of Accumulated Other Comprehensive Income [Member]
Accumulated other comprehensive loss
Net Income (Loss) Attributable to Parent	(800,000)	(400,000)	6,000,000.0	5,000,000.0
Accumulated Other Comprehensive Income (Loss) [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification				(5,400,000)
Other comprehensive income (loss)
Prior to reclassification	11,300,000	(6,700,000)	(31,000,000.0)	(27,200,000)
Reclassification from	(1,500,000)	(700,000)	(10,100,000)	(3,600,000)
Pre-tax	9,800,000	(7,400,000)	(41,100,000)	(30,800,000)
Tax effect	1,600,000	2,500,000	(11,400,000)	(4,000,000.0)
Total Other Comprehensive Income (Loss), net of tax	11,400,000	(4,900,000)	(29,700,000)	(26,800,000)
Accumulated other comprehensive loss
Beginning balance	(223,600,000)	(140,300,000)	(182,500,000)	(113,000,000.0)
Net activity	11,400,000	(4,900,000)	(29,700,000)	(26,800,000)
Ending balance	(212,200,000)	(145,200,000)	(212,200,000)	(145,200,000)
Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent
Other comprehensive income (loss)
Reclassification from	2,900,000	1,400,000	2,400,000	5,400,000
Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent \| Reclassification out of Accumulated Other Comprehensive Income [Member]
Accumulated other comprehensive loss
Income tax expense	800,000	200,000	600,000	1,300,000
Foreign Exchange Forward [Member] \| Available-for-sale Securities and Hedges [Member]
Other comprehensive income (loss)
Pre-tax	(800,000)	(400,000)	(1,000,000.0)	(100,000)
Total Other Comprehensive Income (Loss), net of tax	(600,000)	(300,000)	(800,000)	(100,000)
Accumulated other comprehensive loss
Beginning balance	0	400,000	200,000	200,000
Net activity	(600,000)	(300,000)	(800,000)	(100,000)
Ending balance	(600,000)	100,000	(600,000)	100,000
Foreign Exchange Forward [Member] \| Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent
Other comprehensive income (loss)
Tax effect	(200,000)	(100,000)	(200,000)	0
Interest Rate Swap [Member] \| Available-for-sale Securities and Hedges [Member]
Other comprehensive income (loss)
Pre-tax	(4,600,000)	(10,800,000)	(43,000,000.0)	(28,800,000)
Total Other Comprehensive Income (Loss), net of tax	(3,500,000)	(8,300,000)	(33,100,000)	(22,100,000)
Accumulated other comprehensive loss
Beginning balance	(34,800,000)	5,300,000	(5,200,000)	18,300,000
Net activity	(3,500,000)	(8,300,000)	(33,100,000)	(22,100,000)
Ending balance	(38,300,000)	(3,000,000.0)	(38,300,000)	(3,000,000.0)
Interest Rate Swap [Member] \| Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent
Accumulated Other Comprehensive Income (Loss) [Line Items]
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification				800,000
Other comprehensive income (loss)
Prior to reclassification	(2,900,000)	(9,000,000.0)	(41,700,000)	(23,200,000)
Reclassification from	1,700,000	1,800,000	1,300,000	5,600,000
Tax effect	(1,100,000)	(2,500,000)	(9,900,000)	(6,700,000)
Accumulated other comprehensive loss
Income tax expense	400,000	200,000	300,000	1,300,000
Net Income (Loss) Attributable to Parent	(1,300,000)	(1,600,000)	(1,000,000.0)	(4,300,000)
Currency Swap [Member] \| Available-for-sale Securities and Hedges [Member]
Accumulated other comprehensive loss
Beginning balance	16,300,000	6,300,000	12,200,000	(1,700,000)
Currency Swap [Member] \| Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent
Accumulated Other Comprehensive Income (Loss) [Line Items]
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification				0
Other comprehensive income (loss)
Prior to reclassification	(3,500,000)	(1,000,000.0)	1,900,000	9,300,000
Reclassification from	0	0	0	0
Tax effect	(900,000)	(200,000)	400,000	2,100,000
Foreign Exchange Contract [Member] \| Available-for-sale Securities and Hedges [Member]
Other comprehensive income (loss)
Pre-tax	(3,500,000)	(1,000,000.0)	1,900,000	9,300,000
Total Other Comprehensive Income (Loss), net of tax	(2,600,000)	(800,000)	1,500,000	7,200,000
Accumulated other comprehensive loss
Net activity	(2,600,000)	(800,000)	1,500,000	7,200,000
Ending balance	13,700,000	5,500,000	13,700,000	5,500,000
Foreign Exchange \| Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent
Accumulated Other Comprehensive Income (Loss) [Line Items]
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification				0
Other comprehensive income (loss)
Prior to reclassification	400,000	(800,000)	100,000	(300,000)
Reclassification from	1,200,000	(400,000)	1,100,000	(200,000)
Accumulated other comprehensive loss
Income tax expense	400,000	0	300,000	0
Net Income (Loss) Attributable to Parent	$ (800,000)	$ 400,000	$ (800,000)	$ 200,000

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