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Debt - Contingent Funding Agreements (Details) $ in Millions | Mar. 08, 2018 USD ($) item
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Contingent funding agreements |
Long-Term Debt |
Number of contingent funding agreements | item | 2
Period failure to make payments to trust can be cured before automatic exercise of put options | 30 days
Minimum shareholders' equity excluding AOCI and NCI, to avoid automatic exercise of options | $ 4,000.0
10-year contingent funding agreement | 2028 Trust |
Long-Term Debt |
Term of contingent funding agreement | 10 years
Semi-annual put premium (as a percent) | 1.275%
10-year contingent funding agreement | 2028 Trust | Senior Notes due 2028 |
Long-Term Debt |
Amount of notes issuable under option | $ 400.0
Interest rate (as a percent) | 4.111%
30-year contingent funding agreement | 2048 Trust |
Long-Term Debt |
Term of contingent funding agreement | 30 years
Annual put premium (as a percent) | 1.58%
30-year contingent funding agreement | 2048 Trust | Senior Notes due 2048 |
Long-Term Debt |
Amount of notes issuable under option | $ 350.0
Interest rate (as a percent) | 4.682%
2028 Trust |
Long-Term Debt |
Pre-capitalized trust securities sold | $ 400.0
2048 Trust |
Long-Term Debt |
Pre-capitalized trust securities sold | $ 350.0

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