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Equity and Dividends (Narrative) (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions |  | 1 Months Ended | 3 Months Ended | 9 Months Ended
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Nov. 05, 2025 | Jun. 30, 2025 | Mar. 31, 2025 | Aug. 31, 2024 | Sep. 30, 2025 | Jun. 30, 2025 | Mar. 31, 2025 | Dec. 31, 2024 | Sep. 30, 2024 | Jun. 30, 2024 | Mar. 31, 2024 | Dec. 31, 2023 | Sep. 30, 2025 | Sep. 30, 2024
Dividends Payable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sale of stock, aggregate shares (in shares) |  |  |  | 2.8 |  |  | 1.0 |  |  |  |  |  |  |
Sale of stock, exercise price (in dollars per share) |  |  | $ 68.21 | $ 68.40 |  |  | $ 68.21 |  |  |  |  |  |  |
Sale of stock, available shares (in shares) |  |  |  |  |  |  | 65.5 |  |  |  |  |  |  |
At-the market shelf registration, equity offering sales agreement, aggregate sales price |  |  |  |  | $ 500.0 |  |  |  |  |  |  |  | $ 500.0 |
Sale of stock, price per share (in dollars per share) |  |  |  |  | $ 70.47 |  |  |  |  |  |  |  | $ 70.47 |
Stock issued during period, remaining shares (in shares) |  |  |  |  |  |  |  |  |  |  |  |  | 1.3 |
Proceeds from sale of treasury stock |  |  |  |  |  |  |  |  |  |  |  |  | $ 90.6 |
Dividends to common stockholders (in dollars per share) |  |  |  |  | $ 0.92 | $ 0.90 | $ 0.90 | $ 0.90 | $ 0.90 | $ 0.90 | $ 0.90 | $ 0.90 | $ 2.72 | $ 2.70
Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends to common stockholders (in dollars per share) | $ 0.92 |  |  |  |  |  |  |  |  |  |  |  |  |
At The Market |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sale of stock, additional purchase of shares (in shares) |  |  | 0.2 |  |  |  |  |  |  |  |  |  |  |
Sale of stock, price per share (in dollars per share) |  |  | $ 74.39 |  |  |  | $ 74.39 |  |  |  |  |  |  |
Sale of stock, consideration received |  |  | $ 15.5 |  |  |  |  |  |  |  |  |  |  |
Issuance of common stock (in shares) |  |  |  |  | 0.0 |  |  |  |  |  |  |  | 0.0 |
At The Market, December 2024 and March 2025 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sale of stock, price per share (in dollars per share) |  | $ 74.71 |  |  | $ 73.96 | $ 74.71 |  |  |  |  |  |  | $ 73.96 |
Stock issued during period, remaining shares (in shares) |  |  |  |  | 0.2 | 0.8 |  |  |  |  |  |  |  |
Proceeds from sale of treasury stock |  |  |  |  | $ 11.4 | $ 58.0 |  |  |  |  |  |  |  |
At The Market, Matures in Q2 2026 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sale of stock, additional purchase of shares (in shares) |  | 1.3 |  |  |  |  |  |  |  |  |  |  |  |
Sale of stock, price per share (in dollars per share) |  | $ 71.41 |  |  |  | $ 71.41 |  |  |  |  |  |  |  |
Sale of stock, consideration received |  | $ 91.8 |  |  |  |  |  |  |  |  |  |  |  |

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