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Financial Instruments and Fair Value , Investments (Details) - USD ($) $ in Millions | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | $ 1,637.3 | $ 892.8
Unrealized Gains | 0.0 | 1.0
Unrealized Losses | (2.5) | 0.0
Fair Value | 1,634.8 | 893.8
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position [Abstract] |  |
Less Than 12 Months, Fair Value | 1,215.0 | 240.4
Less Than 12 Months, Unrealized Losses | (2.5) | 0.0
12 Months or Greater, Fair Value | 0.0 | 0.0
12 Months or Greater, Unrealized Losses | 0.0 | 0.0
Total, Fair Value | 1,215.0 | 240.4
Total, Unrealized Losses | (2.5) | 0.0
Available-for-sale Securities, Debt Maturities, Fair Value [Abstract] |  |
Due within one year | 1,194.0 | 775.5
Due within one to three years | 440.8 | 118.3
Fair Value | 1,634.8 | 893.8
Commercial paper |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 566.0 | 185.4
Unrealized Gains | 0.0 | 0.0
Unrealized Losses | (0.2) | 0.0
Fair Value | 565.8 | 185.4
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position [Abstract] |  |
Less Than 12 Months, Fair Value | 288.0 | 61.5
Less Than 12 Months, Unrealized Losses | (0.2) | 0.0
12 Months or Greater, Fair Value | 0.0 | 0.0
12 Months or Greater, Unrealized Losses | 0.0 | 0.0
Total, Fair Value | 288.0 | 61.5
Total, Unrealized Losses | (0.2) | 0.0
Available-for-sale Securities, Debt Maturities, Fair Value [Abstract] |  |
Fair Value | 565.8 | 185.4
Corporate debt securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 540.7 | 410.5
Unrealized Gains | 0.0 | 1.0
Unrealized Losses | (1.2) | 0.0
Fair Value | 539.5 | 411.5
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position [Abstract] |  |
Less Than 12 Months, Fair Value | 494.4 | 111.3
Less Than 12 Months, Unrealized Losses | (1.2) | 0.0
12 Months or Greater, Fair Value | 0.0 | 0.0
12 Months or Greater, Unrealized Losses | 0.0 | 0.0
Total, Fair Value | 494.4 | 111.3
Total, Unrealized Losses | (1.2) | 0.0
Available-for-sale Securities, Debt Maturities, Fair Value [Abstract] |  |
Fair Value | 539.5 | 411.5
U.S. government and agency securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 356.1 | 184.9
Unrealized Gains | 0.0 | 0.0
Unrealized Losses | (1.0) | 0.0
Fair Value | 355.1 | 184.9
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position [Abstract] |  |
Less Than 12 Months, Fair Value | 334.2 | 38.1
Less Than 12 Months, Unrealized Losses | (1.0) | 0.0
12 Months or Greater, Fair Value | 0.0 | 0.0
12 Months or Greater, Unrealized Losses | 0.0 | 0.0
Total, Fair Value | 334.2 | 38.1
Total, Unrealized Losses | (1.0) | 0.0
Available-for-sale Securities, Debt Maturities, Fair Value [Abstract] |  |
Fair Value | 355.1 | 184.9
Certificates of deposit and term deposits |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 169.1 | 112.0
Unrealized Gains | 0.0 | 0.0
Unrealized Losses | (0.1) | 0.0
Fair Value | 169.0 | 112.0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position [Abstract] |  |
Less Than 12 Months, Fair Value | 93.1 | 29.5
Less Than 12 Months, Unrealized Losses | (0.1) | 0.0
12 Months or Greater, Fair Value | 0.0 | 0.0
12 Months or Greater, Unrealized Losses | 0.0 | 0.0
Total, Fair Value | 93.1 | 29.5
Total, Unrealized Losses | (0.1) | 0.0
Available-for-sale Securities, Debt Maturities, Fair Value [Abstract] |  |
Fair Value | 169.0 | $ 112.0
Municipal bonds |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 5.4 |
Unrealized Gains | 0.0 |
Unrealized Losses | 0.0 |
Fair Value | 5.4 |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position [Abstract] |  |
Less Than 12 Months, Fair Value | 5.3 |
Less Than 12 Months, Unrealized Losses | 0.0 |
12 Months or Greater, Fair Value | 0.0 |
12 Months or Greater, Unrealized Losses | 0.0 |
Total, Fair Value | 5.3 |
Total, Unrealized Losses | 0.0 |
Available-for-sale Securities, Debt Maturities, Fair Value [Abstract] |  |
Fair Value | $ 5.4 |

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