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Debt Debt (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
	Sep. 30, 2019	Jun. 30, 2019	Jun. 30, 2018	Jul. 29, 2019	Jul. 12, 2019	Mar. 31, 2019
Debt Instrument [Line Items]
Gain (Loss) on Extinguishment of Debt		$ 0.0	$ (19.0)
Line of Credit Facility, Maximum Borrowing Capacity		2,300.0				$ 2,000.0
Line of Credit Facility, Maximum Borrowing Capacity Through 2020						1,300.0
Line of Credit Facility, Maximum Borrowing Capacity through 2022		1,700.0				$ 1,200.0
Line of Credit Facility, Increase (Decrease), Net		250.0
Tender Offer		600.0
Scenario, Forecast [Member]
Debt Instrument [Line Items]
Gain (Loss) on Extinguishment of Debt	$ 195.7
Line of Credit Facility, Fair Value of Amount Outstanding				$ 125.0
Debt Instrument, Repurchased Face Amount					$ 951.8
Debt Instrument, Repurchase Amount					$ 724.1
7.88%SeniorNotesDue2019 [Member]
Debt Instrument [Line Items]
Long-term Debt, Gross		201.4
4.875%SeniorNotesDue2022Member [Member]
Debt Instrument [Line Items]
Long-term Debt, Gross		620.8
4.75%SeniorNotesDue2024Member [Member]
Debt Instrument [Line Items]
Long-term Debt, Gross		398.1
7.38%SeniorNotesDue2025 [Member]
Debt Instrument [Line Items]
Long-term Debt, Gross		500.0
5.40%SeniorNotesDue2042 [Member]
Debt Instrument [Line Items]
Long-term Debt, Gross		400.0
5.85%SeniorNotesDue2044 [Member]
Debt Instrument [Line Items]
Long-term Debt, Gross		$ 400.0

X

- Definition

Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

+ References

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Fair value amount of debt instrument that was repurchased.

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- Definition

Face (par) amount of the original debt instrument that was repurchased.

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Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity.

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Fair value of the amount outstanding under the credit facility.

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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Tender Offer

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