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Debt (Tables) | 12 Months Ended
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Dec. 31, 2017
Debt Table | Debt at December 31, consisted of:
|  |  | 2017 |  | 2016
(millions) |  |  | Carrying Value |  |  | Fair Value |  |  | Carrying Value |  |  | Fair Value |
3.75% Senior Notes due 2021 (issued: $500.0, August 2011) | $ | 498.8 |  |  | $ | 520.7 |  |  | $ | 498.4 |  |  | $ | 528.8 |
2.45% Senior Notes due 2027 (issued: $500.0, August 2016) | 496.1 |  |  | 477.9 |  |  | 495.8 |  |  | 464.6 |
6 5/8% Senior Notes due 2029 (issued: $300.0, March 1999) | 296.1 |  |  | 382.3 |  |  | 295.9 |  |  | 380.1 |
6.25% Senior Notes due 2032 (issued: $400.0, November 2002) | 395.3 |  |  | 516.9 |  |  | 395.2 |  |  | 499.0 |
4.35% Senior Notes due 2044 (issued: $350.0, April 2014) | 346.5 |  |  | 388.7 |  |  | 346.4 |  |  | 362.3 |
3.70% Senior Notes due 2045 (issued: $400.0, January 2015) | 395.2 |  |  | 402.9 |  |  | 395.1 |  |  | 372.5 |
4.125% Senior Notes due 2047 (issued: $850.0, April 2017) | 841.2 |  |  | 917.1 |  |  | 0 |  |  | 0 |
6.70% Fixed-to-Floating Rate Junior Subordinated Debentures due 2067 (issued: $1,000.0, June 2007; outstanding: $0 and $594.6) | 0 |  |  | 0 |  |  | 594.1 |  |  | 581.2 |
Other debt instruments | 37.1 |  |  | 37.1 |  |  | 127.3 |  |  | 127.3 |
Total | $ | 3,306.3 |  |  | $ | 3,643.6 |  |  | $ | 3,148.2 |  |  | $ | 3,315.8 |
Aggregate Principal Payments on Debt Outstanding | Aggregate required principal payments on debt outstanding at December 31, 2017, are as follows:
(millions) |
Year | Payments |
2018 | $ | 25.0 |
2019 | 12.1 |
2020 | 0 |
2021 | 500.0 |
2022 | 0 |
Thereafter | 2,800.0 |
Total | $ | 3,337.1 |
Cash Flow Hedging [Member] |
Unrealized Gain (Loss) on Interest Rate Cash Flow Hedges Included in Accumulated Other Comprehensive Income | The following table shows the original gain (loss) recognized at debt issuance and the unamortized balance at December 31, 2017, on a pretax basis:
(millions) | Unrealized Gain (Loss) at Debt Issuance |  | Unamortized Balance at December 31, 2017 |
3.75% Senior Notes | $ | (5.1 | ) | $ | (2.1 | )
6 5/8% Senior Notes | (4.2 | ) | (2.7 | )
6.25% Senior Notes | 5.1 |  | 3.6 |
4.35% Senior Notes | (1.6 | ) | (1.5 | )
3.70% Senior Notes | (12.9 | ) | (12.2 | )
4.125% Senior Notes | (8.0 | ) | (7.9 | )
Other Debt Instruments [Member] |
Schedule of Carrying Values and Estimated Fair Values of Debt Instruments [Table Text Block] | The other debt instruments reported in the table above represent ARX indebtedness and consist of:
| December 31, 2017 |  | December 31, 2016 |
Type of debt instrument | Number of Instruments |  |  | Carrying Value |  |  | Number of Instruments |  |  | Carrying Value |  | Stated Maturity Date(s)
Term loans | 2 |  |  | $ | 37.1 |  |  | 2 |  |  | $ | 62.1 |  | December 2018 and 2019
Junior subordinated notes | 0 |  |  | 0 |  |  | 2 |  |  | 41.2 |  | NA
Senior notes | 0 |  |  | 0 |  |  | 4 |  |  | 24.0 |  | NA
Total |  |  | $ | 37.1 |  |  |  |  | $ | 127.3 |  |
NA - Not applicable as the notes were redeemed during 2017.

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