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Debt and Credit Agreements Debt Transactions (Details) - USD ($) $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2018 | Sep. 30, 2018 | Sep. 21, 2018
Schedule of New Debt Issuance [Line Items] |  |  |
Debt Instrument, Redemption Price, Percentage | 101.00% |  |
Debt Instrument Change of Control Repurchase Event Price Percentage | 101.00% |  |
Term Loan |  | $ 500.0 |
3.50% Notes Due 2020 |  |  |
Schedule of New Debt Issuance [Line Items] |  |  |
Debt Instrument, Face Amount | $ 500.0 |  |
Debt Issuance Face Amount |  |  | $ 500.0
Unamortized Discount at Issuance |  |  | 1.0
Senior Notes Net of Discount |  |  | 499.0
Debt Issuance Cost at Issuance |  |  | 2.9
Senior Notes |  |  | 496.1
3.75% Notes Due 2021 |  |  |
Schedule of New Debt Issuance [Line Items] |  |  |
Debt Instrument, Face Amount | 500.0 |  |
Debt Issuance Face Amount |  |  | 500.0
Unamortized Discount at Issuance |  |  | 0.3
Senior Notes Net of Discount |  |  | 499.7
Debt Issuance Cost at Issuance |  |  | 3.2
Senior Notes |  |  | 496.5
4.65% Notes Due 2028 |  |  |
Schedule of New Debt Issuance [Line Items] |  |  |
Debt Instrument, Face Amount | 500.0 |  |
Debt Issuance Face Amount |  |  | 500.0
Unamortized Discount at Issuance |  |  | 1.7
Senior Notes Net of Discount |  |  | 498.3
Debt Issuance Cost at Issuance |  |  | 4.4
Senior Notes |  |  | 493.9
5.40% Notes Due 2048 |  |  |
Schedule of New Debt Issuance [Line Items] |  |  |
Debt Instrument, Face Amount | $ 500.0 |  |
Debt Issuance Face Amount |  |  | 500.0
Unamortized Discount at Issuance |  |  | 2.8
Senior Notes Net of Discount |  |  | 497.2
Debt Issuance Cost at Issuance |  |  | 5.6
Senior Notes |  |  | 491.6
Aggregate Senior Notes Issued [Domain] |  |  |
Schedule of New Debt Issuance [Line Items] |  |  |
Debt Issuance Face Amount |  |  | 2,000.0
Unamortized Discount at Issuance |  |  | 5.8
Senior Notes Net of Discount |  |  | 1,994.2
Debt Issuance Cost at Issuance |  |  | 16.1
Senior Notes |  |  | $ 1,978.1

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