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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 |  |  |  |

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- 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 Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=109500613&loc=SL6031897-161870 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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